Micro Four Thirds system

The Micro Four Thirds system (MFT) is a standard created by Olympus and Panasonic, and announced on August 5, 2008,^[1] for the design and development of mirrorless interchangeable lens digital cameras, camcorders and lenses.^[2] In 2014, JK Imaging Ltd., which holds the Kodak brand, released its first Micro Four Thirds camera, the Kodak Pixpro S-1;^[3] several lenses and niche camera makers have products made for the standard. In 2015, DJI provided its drone with optional MFT cameras. Both cameras can capture 16MP stills and up to 4K/30fps video with an option of 4 interchangeable lenses ranging from 12mm to 17mm.^[4]

MFT shares the original image sensor size and specification with the Four Thirds system, designed for DSLRs. Unlike Four Thirds, the MFT system design specification does not provide space for a mirror box and a pentaprism, which facilitates smaller body designs and a shorter flange focal distance, and hence smaller lenses. Virtually any lens can be used on MFT camera bodies, as long as an adapter exists. For instance, Four Third lenses can be used with auto focus using the adapters designed by Olympus and Panasonic.

Sensor size and aspect ratio

The image sensor of Four Thirds and MFT is commonly referred to as a 4/3" type or 4/3 type sensor (inch-based sizing system is derived from now obsolete video camera tubes). The sensor measures 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm (21.6 mm diagonal), comparable to the frame size of 110 film.^[5] Its area, ca. 220 mm², is approximately 30% less than the quasi-APS-C sensors used in other manufacturers' DSLRs, yet is around 9 times larger than the 1/2.5" sensors typically used in compact digital cameras.

The Four Thirds system uses a 4:3 image aspect ratio, in common with other compact digital cameras but unlike quasi-APS-C or 24×36 mm DSLRs, which usually adhere to the 3:2 aspect ratio of the traditional 35 mm format. Thus the "Four Thirds" refers to both the size of the image and the aspect ratio of the sensor.^[6] Note that actual size of the chip is considerably less than 4/3 of an inch, the length of the diagonal being only 22.5 mm. The 4/3 inch designation for this size of sensor dates back to the 1950s and vidicon tubes, when the external diameter of the camera tube was measured, not the active area.

The MFT design standard also calls for being able to record multiple formats, 4:3, 3:2 (traditional DSLR formats with origins with 35 mm film still cameras), 16:9 (the native HD video format specification), and 1:1 (a square format). With the exception of two MFT cameras, all MFT cameras record in a native 4:3 format image aspect ratio, and through cropping of the 4:3 image, can record in 16:9, 3:2 and 1:1 formats. This multiple recording format flexibility is a MFT system design standard, which also incorporates seamless integration of HD video recording in the same camera body.

The 2009 introduction of the Panasonic Lumix DMC-GH1 camera extends the 4:3 format image aspect ratio recording capabilities to native 16:9 and 3:2 image aspect ratio formats, rather than crops of a native 4:3 image. The GH1 uses a bigger sensor matrix that uses the full diagonal of the image circle in all three formats. This is called multi-aspect capability. To date, the multi-aspect sensor is common only to the Panasonic GH1^[7] and its successor the Panasonic Lumix DMC-GH2.^[8]

In addition, all current Micro Four Thirds cameras have sensor dust removal technologies, but this is not exclusive to the format.

Lens mount

The MFT system design specifies a new bayonet type lens mount with a flange focal distance of slightly under 20 mm – half as deep as the Four Thirds system design. By avoiding internal mirrors the MFT standard allows a much thinner camera body. Viewing is achieved on all models by live view electronic displays with LCD screens. In addition some models feature a built-in electronic viewfinder (EVF) while others may offer optional detachable electronic viewfinders, or even as an option an independent optical viewfinder typically matched to a particular non-zoom prime lens. The flange diameter is about 38 mm, 6 mm less than that of the Four Thirds system. Electrically, MFT uses an 11-contact connector between lens and camera, adding to the nine contacts in the Four Thirds system design specification. Olympus claims full backward compatibility for many of its existing Four Thirds lenses on MFT bodies, using a purpose built adapter with both mechanical and electrical interfaces (though when using FT lenses, the speed of the autofocus may be slower in certain conditions than when using dedicated Four Thirds body, because of differences in type of the AF system).

The shallow but wide MFT lens mount also allows the use of existing lenses including Leica M, Leica R, and Olympus OM system lenses, via Panasonic and Olympus adapters. Aftermarket adapters include Leica Screw Mount, Contax G, C mount, Arri PL mount, Canon, Nikon, and Pentax, among others.^[9] In fact, almost any still camera, movie or video camera interchangeable lens that has a flange focal distance greater than or marginally less than 20 mm can often be used on MFT bodies via an adapter. While MFT cameras can only use many of these "legacy" lenses with manual focus and aperture control mode, hundreds of lenses are available, even those that survive for cameras no longer in production.

Autofocus design

The MFT system design specifies the use of contrast-detection autofocus (CDAF), which is a common autofocus system for compact or "point-and-shoot". By comparison, virtually all DSLRs use a different autofocus system known as phase-detection autofocus (PDAF). The use of separate PDAF sensors has long been favored in DSLR systems because of mirror box and pentaprism design, along with better performance for fast-moving subjects.

The (non-Micro) Four Thirds system design standard specifies a 40 mm flange focal length distance, which allowed for using a single lens reflex design, with mirror box and pentaprism. Four Thirds DSLR cameras designed by Olympus and Panasonic initially used exclusively PDAF focusing systems. Olympus then introduced the first live view DSLR camera, which incorporated both traditional DSLR phase focus and also optional contrast detection focus. As a result, newer Four Thirds system lenses were designed both for PDAF and contrast focus. Several of the latter Four Thirds lenses focus on Micro Four Thirds proficiently when an electrically compatible adapter is used on the Olympus and the later Panasonic Micro Four Thirds cameras, and they focus on Micro Four Thirds cameras much quicker than earlier generation Four Thirds lenses can.

At the announcement of the MFT system design standard it was suggested that the powerful focusing motors required for contrast-detection autofocus by compact cameras and MFT may not operate properly on at least some of the existing Four Thirds lenses designed for phase-detection autofocus.^[10]

Many PDAF Four Thirds system lenses, when using adapters with proper electrical connections on Micro Four Thirds cameras, do focus much more slowly than "native" designed MFT lenses. Some Four Thirds bodies do not focus as quickly as others, or as accurately as does contrast focus. This is a downside of phase focus, which can shift focus to the front or behind the calculated focus position for each lens. Micro Four Thirds also focus Four Thirds lenses faster than a Four Thirds camera focuses using the Four Thirds "Live View" focus. Most Four Thirds lenses still work on Micro Four Thirds, and the relative speed depends on the camera model and lens. Overall, native Micro Four Thirds lenses focus much faster than the majority of Four Thirds lenses.

An advantage to the newly introduced MFT system designed cameras is the already-existing family of very high quality, large aperture, automatic exposure, autofocusing, and sometimes even optical image stabilized Four Thirds lenses made by Olympus, Panasonic and Leica.

Olympus claims their Pen cameras (the E-P5, the smaller E-PL5, and its less expensive "mini" version E-PM2) are the fastest focusing removable lens cameras, including those that use phase technology (DSLR cameras). Comparative tests and the basis for all the speed improvements and whether the technology can track like a phase focus designed for sport applications are not yet known.

Comparison with other systems

For comparison of the original Four Thirds with competing DSLR system see Four Thirds system#Advantages, disadvantages and other considerations

Compared to most digital compact cameras and many bridge cameras, Micro Four Thirds cameras may have better larger sensors, and interchangeable lenses. Some lenses feature wider apertures than those available on many compacts, providing more control over depth-of-field and yielding greater creative possibilities. However, Micro Four Thirds cameras also tend to be larger, heavier and more expensive than compact cameras.

Compared to most digital SLRs, Micro Four Thirds cameras are smaller and lighter. However, they also have smaller sensors (and therefore may have inferior image quality, especially in low light conditions), and often lack features such as viewfinders and built-in flash units. Micro Four Thirds cameras sometimes afford greater depth-of-field than SLRs depending on the lens used. They are not necessarily less expensive than SLRs.

The much shorter flange focal distance enabled by the removal of the mirror allows normal and wide angle lenses to be significantly smaller because they do not have to use strongly retrofocal designs.

The Four Thirds sensor format used in MFT cameras is equivalent to a 2.0 crop factor when compared to a 35 mm film camera. This means that the field of view of a MFT lens is the same as a Full Frame lens with twice the focal length. Practically speaking, this means that a 50 mm lens on a MFT body would have a field of view equivalent to a 100 mm lens on a full frame camera. Said another way, normal lenses on MFT cameras would be only 25 mm. For this reason, MFT lenses can be smaller and lighter because to achieve the equivalent 35 mm film camera field of view, the MFT focal length is much shorter. See the table of lenses below to understand the differences better. Typical DSLR sensors such as Canon's APS-C sensors, have a crop factor of 1.6, compared to full frame's (35 mm) 1.0, and Four Thirds 2.0.

Equivalents

Equivalent focal lengths are given, if the angle of view is identical.^[11]

The depth of field is identical, if angle of view and absolute aperture size are identical. At the same image resolution also the relative diameters of the Airy disks are identical. Therefore, the equivalent f-numbers are varying.^[12]

In this case, i.e. with the same luminous flux within the lens, the illuminance quadracially decreases and the luminous intensity quadratically increases with the image size. Therefore, all systems detect the same luminances and the same exposure values in the image plane, and as a consequence of this the equivalent exposure indexes are different in order to get the identical shutter speeds (i.e. exposure times).^[13]

The following table exemplarily shows a few identical image parameters for some popular image sensor classes compared to Micro Four Thirds:^[14]

Image sensor class	Equivalent focal length at wide angle (diagonal angle of view ≈ 75°)	Equivalent focallength at normal angle (diagonal angle of view ≈ 47°)	Equivalent focallength at tele angle (diagonal angle of view ≈ 29°)	Equivalent f-number at identical depth of field and identical diffraction-limited resolution	Equivalent exposure index (ISO speed) at identical exposure time
Nikon 1	10 mm	18 mm	31 mm	1,7	100
Micro Four Thirds	14 mm	25 mm	42,5 mm	2,4	200
APS-C	18 mm	33 mm	57 mm	3,2	360
Full-frame	28 mm	50 mm	85 mm	4.8	800

Advantages of Micro Four Thirds over DSLR cameras

Micro Four Thirds has several advantages over larger format cameras and lenses:

• Smaller and lighter
• The shorter flange focal distance means that most manual lenses can be adapted for use, though C-mount lenses have a slightly shorter flange focal distance and are trickier to adapt.
• The shorter flange focal distance may also allow for smaller, lighter and lower cost lenses. This is especially true for wide angle lenses: Compare the Olympus 4/3 7–14mm f/4 zoom (approximately $1800), with the lumix micro 4/3 7–14mm F/4 lens (approximately $800).
• Forward or back focus does not occur with contrast focus like it can when using DSLR phase focus, and likewise each lens does not have to be individually calibrated to each camera, which can be required for DSLRs to have accurate focus.
• The absence of a mirror eliminates the need for an additional precision assembly, along with its "mirror slap" noise and resultant camera vibration/movement.
• Viewfinders can be used when filming videos.
• In continuous mode (video takes or sequential shots) the smaller sensor can be cooled better to avoid the increase of image noise.
• The autofocus performance is the same for stills and videos, so the speed is much faster than conventional DSLRs in video mode.
• Because of the reduced sensor-flange distance, the sensor is easier to clean than with a DSLR, which also have delicate mirror mechanisms attached.
• The smaller sensor size may allow for smaller and lighter telephoto-lens equivalents.
• The smaller flange distance, which is 20 mm, allows for easier manufacturing of wide, fast, and telephoto lenses, as well as the option to adapt nearly any photographic and cine lens ever made.
• Smaller and lighter cameras and lenses allow discretion and portability.
• The smaller sensor size gives deeper depth-of-field for the same equivalent field of view and aperture. This can be desirable in some situations, such as landscape and macro shooting.

Advantages of the electronic viewfinder

Though many DSLRs also have "live view" functionality, these function relatively poorly compared to a Micro Four Thirds electronic viewfinder (EVF), which has the following advantages:

• Real-time preview of exposure, white balance, and tone.
• Can show a low-light scene brighter than it is.
• The viewfinder can zoom into one's preview, which a mirror-based viewfinder cannot do. This is why using manual focus through a zoomed EVF is more precise than manual focus through a mirror.
• The viewfinder displays how the sensor sees the potential picture, rather than an optical view, which may differ.
• The view can appear larger than some optical viewfinders, which often have a tunnel-like view.
• Not reliant on a moving mirror and shutter, which otherwise adds noise, weight, design complexity, and cost.
• No weight or size penalty for better quality of materials and design. Optical viewfinder quality varies greatly across all DSLRs.^[15]

Olympus and Panasonic approached the implementation of electronic viewfinders in two ways: the built-in EVF, and the optional hotshoe add-on EVF.

Until the introduction of the OM-D E-M5 in February, 2012, none of the Olympus designs included a built-in EVF. Olympus has four available add-on hotshoe viewfinders. The Olympus VF-1 is an optical viewfinder with an angle of view of 65 degrees, equivalent to the 17mm pancake lens field of view, and was designed primarily for the EP-1. Olympus has since introduced the high resolution VF-2 EVF,^[16] and a newer, less expensive, slightly lower resolution VF-3^[17] for use in all its MFT cameras after the Olympus EP-1. These EVF's not only slip into the accessory hotshoe, but also plug into a dedicated proprietary port for power and communication with Olympus cameras only. Both the VF-2 and VF-3 may also be used on high-end Olympus compact point and shoot cameras such as the Olympus XZ-1. Olympus announced the VF-4 in May 2013, along with the fourth generation PEN flagship, the E-P5.

As of mid-2011, Panasonic G and GH series cameras have built in EVF's, while two of the three GF models are able to use the add-on LVF1^[18] hotshoe EVF. The LVF1 must also plug into a proprietary port built into the camera for power and communication. This proprietary port and the accessory is omitted in the Panasonic Lumix DMC-GF3 design. Similar to Olympus, the LVF1 is usable on high-end Panasonic compact point and shoot cameras, such as the Panasonic Lumix DMC-LX5.

Disadvantages of Micro Four Thirds compared to DSLRs

• The sensor is 40% smaller in area (2.0× crop factor) than the smaller-than-APS-C (1.5× crop factor, or 1.6x for Canon pseudo-APS-C) sized sensors common in other systems, and 75% smaller (i.e. a quarter of the area) than a full frame sensor (1.0× crop factor) (35 mm equivalent), which can mean lower image quality when all other variables are the same. This might include poorer color transitions and more noise at identical ISO settings, especially in low light, when compared with the larger sensors.^[19]
• Contrast detect autofocus systems such as those used in Micro Four Thirds cameras were initially slower than the phase detect systems used in advanced DSLRs. This gap was eliminated with the Olympus OM-D E-M5 when shooting static subjects.^[20] The tracking of subjects moving towards or away from the camera was also difficult with contrast detection, however this issue was eliminated in 2013 with the introduction of the Olympus OM-D E-M1's hybrid phase detection auto-focus system.
• Due to the absence of a mirror and prism mechanism, there is no ability to use a through-the-lens optical viewfinder. A through-the-lens electronic viewfinder, an attachable not-through-the-lens optical viewfinder (similar to a rangefinder or TLR), or the universally supplied LCD screen must be used instead.
• Theoretically, changing lenses can expose the sensor to more dust in a "mirrorless" camera design, compared to DSLRs that have both a mirror and a closed shutter protecting the sensor. Mirrorless cameras have dust-removal systems that try to minimize this problem, and in practice they experience fewer dust problems than a DSLR.^[21] Many micro-four third users report never having found dust on the sensor at all.^[22]
• A larger crop factor (2× multiplier versus quasi-APS-C's 1.5× ) means greater depth-of-field for the same equivalent field of view and f/stop when compared with quasi-APS-C and especially full frame cameras. This can be a disadvantage when a photographer wants to blur a background, such as when shooting portraits. This issue is mitigated by the availability of relatively inexpensive, fast, high quality prime lenses, preferred also for their compact size and light weight.^[23]
• Micro Four Thirds cameras are smaller than DSLRs or quasi-APS-C cameras, and this can result in relatively poor ergonomics for bigger-handed users, while it benefits most others. This applies especially to handling, the depth of the right-hand grip, and the size and placement of buttons and dials.
• Micro Four Thirds lenses cannot be used on 35mm equivalent and APS-C cameras due to lens vignetting.

Advantages of Micro Four Thirds over compact digital cameras

• Greatly increased sensor size (5–9 times larger area) gives much better image quality, e.g. low light performance and greater dynamic range, with reduced noise.
• Interchangeable lenses allow more optical choices including niche, legacy, and future lenses.
• Shallower depth of field possible (e.g. for portraits, for bokeh...).

Disadvantages of Micro Four Thirds compared to compact digital cameras

• Increased physical size (camera and lenses are both larger due to increased sensor size);
• Extreme zoom lenses available on compacts (such as 10×-30× models) are more expensive or simply not available on large sensor cameras due to physical size, cost, and practicality considerations;
• Similarly, larger sensors and shallow depth-of-field make bundled macro capability and close focusing more difficult, often requiring separate, specialized lenses.
• Higher cost.

Popularity with adapted/legacy lenses

• Due to the short native flange distance, of the Micro Four Thirds System, the usage of adapted lenses from practically all formats has become widely popular.
• Because lenses can be used from old and abandoned camera systems, adapted lenses typically represent good value for the money.
• Adapters ranging from low-to high-quality are readily available for purchase online. Canon FD, Nikon F (G lenses require special adapters), MD/MC, Leica M, M42 Screw Mount, and C-mount Cine lenses to name a few are all easily adaptable to the Micro Four Thirds system with glassless adapters resulting in no induced loss of light or sharpness.
• Adapted lenses retain their native focal lengths but have a doubled field of view—i.e., an adapted 50mm lens is still a 50mm lens in terms of focal length but has a 100mm field of view due to the Micro Four Thirds System 2x crop factor.
• Due to the 2x crop factor of the Micro Four Thirds System however, most adapted glass from the 35mm film era and current DSLR lineups provide effective fields of view varying from normal to extreme telephoto. Wide angles are generally not practical for adapted use from both an image quality and value point of view.
• Using older adapted lenses on micro four thirds sometimes leads to a slight losses in image quality. This is the result of placing high resolution demands on the center crop of decade old 35mm lenses. Therefore, 100% crops from the lenses do not usually represent the same level of pixel-level sharpness as they would on their native formats.
• Another slight disadvantage of using adapted lenses can be size. By using a 35mm film lens, one would be using a lens that casts an image circle that is far larger than what is required by Micro Four Thirds Sensors.
• The main disadvantage of using adapted lenses however, is that focus is manual even with natively autofocus lenses. Full metering functionality is maintained however, as are some automated shooting modes (aperture priority).
• A further disadvantage shared with all systems that do not conform to the internal dimensions of the Leica mount specification is that some LM and LTM lenses with significant rear protrusions simply do not fit inside the camera body and risk damaging lens or body. An example is the Biogon type of lens.
• Overall, the ability to use adapted lenses gives Micro Four Thirds a great advantage in overall versatility and the practice has gained a somewhat cult following. Image samples can be found readily online, and in particular on the MU-43 adapted lenses forum.

Micro Four Thirds system cameras

As of Jun 2012, Olympus, Panasonic, Cosina Voigtländer, Carl Zeiss AG, Jos. Schneider Optische Werke GmbH, Komamura Corporation, Sigma Corporation, Tamron,^[24] Astrodesign,^[24] Yasuhara,^[25] and Blackmagic Design^[26] have a commitment to the Micro Four Thirds system.

The first Micro Four Thirds system camera was Panasonic Lumix DMC-G1, which was launched in Japan in October 2008.^[27] In April 2009, Panasonic Lumix DMC-GH1 with HD video recording added to it.^[28]

The first Olympus model, the Olympus PEN E-P1, was shipped in July 2009. In January 2014, JK Imaging Ltd. launched its Kodak-branded model S-1.

In August 2013 SVS Vistek GmbH in Seefeld, Germany introduced the first high-speed industrial MFT lens mount camera using 4/3" sensors from Truesense Imaging, Inc (formally Kodak sensors), now part of ON Semiconductor. Their Evo "Tracer" cameras range from 1 megapixels at 147 frames per second (fps) to 8 megapixels at 22 fps.

Blackmagic design has a range of cameras made for cinematography.

Major features of available and announced Micro Four Thirds system camera bodies

Item	Model	Sensor	Electronic View Finder (EVF)	Announced
1	Panasonic Lumix DMC-G1	4:3, 13.1 MP (12.1 MP effective)	EVF; 1.4× magnification; 1.44M dots	2008-10October 2008[29]
2	Panasonic Lumix DMC-GH1	4:3; 3:2; 16:9 (multi-aspect); 14.0 MP (12.1 MP effect)	EVF; 1.4× mag; 1.44 M dots	2009-04April 2009[30]
3	Olympus PEN E-P1	4:3, 13.1 MP (12.3 MP effect)	N/A	2009-07July 2009[31]
4	Panasonic Lumix DMC-GF1	4:3, 13.1 MP (12.1 MP effect)	opt. EVF LVF1; 1.04× mag; 202 K dots	2009-09September 2009[32]
5	Olympus PEN E-P2	4:3, 13.1 MP (12.3 MP effect)	opt. EVF VF-2; 1.15× mag; 1.44 M dots	2009-11November 2009[33]
6	Olympus PEN E-PL1	4:3, 13.1 MP (12.3 MP effect)	opt. EVF VF-2; 1.15× mag; 1.44 M dots	2010-02February 2010[34]
7	Panasonic Lumix DMC-G10	4:3, 13.1 MP (12.1 MP effect)	EVF; 1.04× magnification; 202 K dots	2010-03March 2010[35]
8	Panasonic Lumix DMC-G2	4:3, 13.1 MP (12.1 MP effect)	EVF; 1.4× mag; 1.44 M dots	2010-03March 2010[36]
9	Panasonic Lumix DMC-GH2	4:3; 3:2; 16:9 (multi-aspect); 18.3 MP (16.0 MP effect)	EVF; 1.42× mag; 1.53 M dots	2010-09September 2010[37]
10	Panasonic Lumix DMC-GF2	4:3, 13.1 MP (12.1 MP effect)	opt. EVF; 1.04× mag; 202 K dots	2010-11November 2010[38]
11	Olympus PEN E-PL1s	4:3, 13.1 MP (12.3 MP effect)	opt. EVF VF-2; 1.15× mag; 1.44 M dots	2010-11November 2010[39]
12	Olympus PEN E-PL2	4:3, 13.1 MP (12.3 MP effect)	opt. EVF VF-2; 1.15× mag; 1.44 M dots	2011-01January 2011[40]
13	Panasonic Lumix DMC-G3	4:3, 16.6 MP (15.8 MP effect)	EVF; 1.4× mag; 1.44 M dots	2011-05May 2011[41]
14	Panasonic Lumix DMC-GF3	4:3, 13.1 MP (12.1 MP effect)	N/A	2011-06June 2011[42]
15	Olympus PEN E-P3	4:3, 13.1 MP (12.3 MP effect)	opt. EVF VF-2; 1.15× mag; 1.44 M dots	2011-06June 2011[43]
16	Olympus PEN E-PL3	4:3, 13.1 MP (12.3 MP effect)	opt. EVF VF-2; 1.15× mag; 1.44 M dots	2011-06June 2011[44]
17	Olympus PEN E-PM1	4:3, 13.1 MP (12.3 MP effect)	opt. EVF VF-2; 1.15× mag; 1.44 M dots	2011-06June 2011[45]
18	Panasonic Lumix DMC-GX1	4:3, 16.6 MP (16 MP effect)	opt. EVF LVF2; 1.4× mag; 1.44 M dots	2011-11November 2011 [46]
19	Olympus OM-D E-M5	4:3, 16.9 MP (16.1 MP effect)[47]	EVF; 1.15× mag; 1.44 M dots	2012-02February 2012[48]
20	Panasonic Lumix DMC-GF5	4:3, 13.1 MP (12.1 MP effect)	N/A	2012-04April 2012[49]
21	Panasonic Lumix DMC-G5	4:3, 18.3 MP (16.1 MP effect)[50]	EVF; 1.4× mag; 1.44 M dots	2012-04July 2012[51]
22	Panasonic Lumix DMC-GH3	4:3, 17.2 MP (16.05 MP effect)	EVF; 1.34× mag; 1.7 M dots	2012-04September 2012
23	Olympus PEN E-PL5	4:3, 16.9 MP (16.1 MP effect)	opt. EVF VF-2; 1.15× mag; 1.44 M dots	2012-09September 2012
24	Olympus PEN E-PM2	4:3, 16.9 MP (16.1 MP effect)	opt. EVF VF-2; 1.15× mag; 1.44 M dots	2012-09September 2012
25	Panasonic Lumix DMC-GF6	4:3, 16.9 MP (16.1 MP effect)	N/A	2013-04April 2013
26	Blackmagic Pocket Cinema Camera	16:9, 12.48×7.02 mm (sensor size), 1920 × 1080 (effective resolution)	N/A	2013-04April 2013
27	Panasonic Lumix DMC-G6	4:3, 18.3 MP (16.1 MP effect)	EVF; 1.4x mag; 1.44 M dots	2013-04April 2013
28	Olympus PEN E-P5	4:3 / 16.05 MP (4/3 Live MOS sensor)	EVF VF-4	2013-05May 2013
29	Olympus PEN E-PL6	4:3 / 16.05 MP (4/3 Live MOS sensor)	EVF VF-4	2013-05May 2013
30	Panasonic Lumix DMC-GX7	4:3 / 16 MP (4/3 Live MOS sensor)	EVF	2013-08August 2013
31	Olympus OM-D E-M1	4:3 / 16 MP (4/3 Live MOS sensor)	2.36 million dots EVF	2013-09September 2013
32	Panasonic DMC-GM1	4:3 / 16 MP (4/3 Live MOS sensor)	N/A	2013-08October 2013
33	Kodak Pixpro S-1	4:3 / 16 MP (4/3 CMOS sensor)	N/A	2014-01January 2014
34	Olympus OM-D E-M10	4:3, 16 MP (4/3 Live MOS sensor)	1.44 million dots EVF	2014-01January 2014
35	Panasonic Lumix DMC-GH4	4:3, 16 MP (4/3 Live MOS sensor)	2.36 million dots EVF	2014-01February 2014
36	Olympus PEN E-PL7	4:3, 17.2 MP (4/3 Live MOS sensor; 16.1  MP effect)	opt. 2.36 million dots EVF	2014-08August 2014[52]
37	Panasonic Lumix DMC-GM5	4:3, 16 MP (4/3 Live MOS sensor)	1.16 million dots EVF	2014-09September 2014
38	Panasonic Lumix DMC-GF7	4:3, 17 MP (4/3 CMOS sensor; 16 MP effect)	N/A	2015-01January 2015[53]
39	Olympus OM-D E-M5 II	4:3, 16 MP (4/3 Live MOS sensor)	2.36 million dots EVF	February 2015[54]
40	Olympus Air	4:3, 16 MP (4/3 Live MOS sensor)	N/A	February 2015[55]
41	JVC GY-LS300 4KCAM Handheld S35 mm Camcorder	Super-35 mm / 13.5 MP (CMOS sensor)	0.24” 1.56 MP 16:9 EVF	February 2015
42	Panasonic Lumix DMC-G7	4:3, 16.8 MP[56]	EVF; 1.4× mag; 2.36 M dots	May 2015
43	Panasonic Lumix DMC-GX8	4:3, 20 MP[57]	EVF; 1.54× mag; 2.36 M dots	July 2015
44	Olympus OM-D E-M10 Mark II	4:3, 16 MP (4/3 Live MOS sensor)	EVF; 1.23x mag; 2.36 M dots	August 2015
45	DJI Zenmuse X5	4:3, 16 MP (4/3 Live MOS sensor)	N/A	September 2015
46	Olympus Pen F	4:3, 20 MP (4/3 Live MOS sensor)	EVF; 1.08x to 1.23x mag; 2.36 M dots	February 2016

Micro Four Thirds lenses

A promise of the Micro Four Thirds standard is reduced lens size and weight. The reduced flange focal distance of Micro Four Thirds lets most lenses be made significantly smaller and cheaper than for a traditional DSLR, because the retrofocus optical schemes can be avoided or made less extreme. Of particular interest in illustrating this fact are the Panasonic 7–14 mm ultra-wide angle (equivalent to 14–28 mm in the 35 mm film format) and the Olympus M.Zuiko Digital ED 9–18 mm ultra wide-angle lens (equivalent to an 18–36 mm zoom lens in the 35 mm film format). On the telephoto end, the Panasonic 100–300 mm and Olympus 75–300 mm zooms show how small and light extreme telephotos can be made. The 300 mm focal length in Micro Four Thirds is equivalent to 600 mm focal length in more traditional full frame cameras.

When compared to a full frame camera lens providing a similar angle of view, rather than weighing a few kilograms (several pounds) and generally having an length of over 60 cm (2 ft) end to end, the optically stabilized Panasonic Lumix G Vario 100–300 mm lens weighs just 520 grams (18.3 oz), is only 126 mm (5.0 in) long, and uses a relatively petite 67 mm filter size.^[58] As a point of comparison, the Nikon 600 mm f5.6 telephoto weighs 3600 grams (7.9 lb), is 516.5 mm (20.3 in) in length and uses a custom 122 mm filter.^[59]

Further, both Panasonic and Olympus manufacture an adapter^[60] to enable use of any Four Thirds lenses on Micro Four Thirds cameras. While many Four Thirds lenses accept firmware updates to enable contrast autofocusing, some are slow to autofocus, and some others are manual-focus-only.

Image stabilization approaches

Olympus and Panasonic approach image stabilization (IS) differently. Olympus uses sensor-shift image stabilization, which it calls IBIS (In-Body Image Stabilization). IBIS stabilizes the image by shifting of the entire sensor. Panasonic uses lens-based stabilization, which it calls Mega OIS. Mega OIS stabilizes the image by shifting a small optical block within the lens. In August 2013 Panasonic also introduced a camera (Lumix DMC-GX7) featuring a built-in IBIS.

Panasonic claims that OIS is more accurate because the stabilization system can be designed for the particular optical characteristics of each lens. A disadvantage of this approach is that the OIS motor and shift mechanism must be built into each lens, making each lens physically larger, heavier and more expensive than a comparable non-OIS lens. As of mid-2011, of the available and announced Panasonic lenses, the 8 mm fisheye, 7–14 mm wide angle zoom, 14 mm prime, and 20 mm prime are not image stabilized.

Whilst none of the Olympus lenses have built-in IS, all Olympus Micro Four Thirds cameras have in-camera IS, and therefore all Olympus M.Zuiko Digital lenses benefit from the camera's stabilization system. The advantage with Olympus' in-body IS is that Olympus lenses are smaller and lighter than comparable Panasonic lenses, and even vintage manual focus lenses can make use of the in-body stabilization when used with an appropriate mount adapter. This latter fact has added to interest in Micro Four Thirds cameras by many hobbyists, especially amongst users of traditional Leica or Voigtländer rangefinder cameras. Olympus introduced in 2012 a new leap forward IBIS technology: Olympus "5 Axis" IBIS system, initially only available on "OM-D" generation Olympus cameras.

Lens compactness and mount adaptability

Since most Micro-Four-Thirds lenses have neither a mechanical focussing ring nor an aperture ring, adapting these lenses for other camera mounts is impossible or compromised. A variety of companies manufacture adapters to use lenses from nearly any legacy lens mount^[9] (such lenses, of course, support no automatic functions.) For the Four Third lenses that can be mounted on MFT bodies, see Four Thirds system lenses. For the Four Third lenses that support AF, see.^[61] For those that support fast AF (Imager AF), see.^[62]

As of November 2013, the following Micro Four Thirds system lenses, which can be used by all MFT camera bodies, except as noted, have been released or announced with availability within 3 months of announcement:

Zoom lenses

Wide zoom lenses

Brand	Product Name	Focal Length	35mm EFL	Aperture	Remarks
Olympus	Olympus M.Zuiko Digital ED 7-14mm f/2.8 PRO	7-14mm	14-28mm	f/2.8	7.5 cm minimum focus distance
Olympus	Olympus M.Zuiko Digital ED 9-18mm f/4-5.6	9-18mm	18-36mm	f/4.0-5.6
Panasonic	Panasonic Lumix G Vario 7-14mm f/4 Asph.	7-14mm	14-28mm	f/4

Standard zoom lenses

Brand	Product Name	Focal Length	35mm EFL	Aperture	Remarks
Panasonic	Panasonic Lumix G X Vario 12-35mm f/2.8 Asph., Power O.I.S.	12-35mm	24-70mm	f/2.8	Announced May 21, 2012
Olympus	Olympus M.Zuiko Digital ED 12-40mm f/2.8 PRO	12-40mm	24-80mm	f/2.8	Announced September 2013
Olympus	Olympus M.Zuiko Digital ED 12-50mm f/3.5-6.3 EZ	12-50mm	24-100mm	f/3.5–6.3
Olympus	Olympus M.Zuiko Digital ED 14-42mm f/3.5-5.6	14-42mm	28-84mm	f/3.5–5.6
Olympus	Olympus M.Zuiko Digital ED 14-42mm f/3.5-5.6 L	14-42mm	28-84mm	f/3.5–5.6
Olympus	Olympus M.Zuiko Digital ED 14-42mm f/3.5-5.6 II MSC	14-42mm	28-84mm	f/3.5–5.6
Olympus	Olympus M.Zuiko Digital ED 14-42mm f/3.5-5.6 IIR MSC	14-42mm	28-84mm	f/3.5–5.6
Olympus	Olympus M.Zuiko Digital ED 14-42mm f/3.5-5.6 EZ	14-42mm	28-84mm	f/3.5–5.6	Announced January 2014
Panasonic	Panasonic Lumix G Vario 14-42mm f/3.5–5.6 Asph., Mega O.I.S.	14-42mm	28-84mm	f/3.5–5.6
Panasonic	Panasonic Lumix G Vario 14-42mm f/3.5–5.6 II Asph., Mega O.I.S.	14-42mm	28-84mm	f/3.5–5.6	Announced January 29, 2013
Panasonic	Panasonic Lumix G Vario 14-45mm f/3.5–5.6 Asph., Mega O.I.S.	14-45mm	28-90mm	f/3.5–5.6
Panasonic	Panasonic Lumix G X Vario PZ 14-42mm f/3.5–5.6 Asph., Power O.I.S.	14-42mm	28-84mm	f/3.5–5.6	Announced August 26, 2011

Telephoto zoom lenses

Brand	Product Name	Focal Length	35mm EFL	Aperture	Remarks
Olympus	Olympus M.Zuiko Digital ED 40-150mm f/2.8 PRO	40-150mm	80-300mm	f/2.8	Announced September 2013
Olympus	Olympus M.Zuiko Digital ED 40-150mm f/4-5.6	40-150mm	80-300mm	f/4-5.6	Announced September 2010
Olympus	Olympus M.Zuiko Digital ED 40-150mm f/4-5.6 R	40-150mm	80-300mm	f/4-5.6
Olympus	Olympus M.Zuiko Digital ED 75-300mm f/4.8-6.7	75-300mm	150-600mm	f/4.8-6.7
Olympus	Olympus M.Zuiko Digital ED 75-300mm f/4.8-6.7 II	75-300mm	150-600mm	f/4.8-6.7
Panasonic	Panasonic Lumix G Vario 45–150mm f/4–5.6 Asph., Mega O.I.S.	45-150mm	90-300mm	f/4-5.6	Announced July 18, 2012
Panasonic	Panasonic Lumix G Vario 45–200mm f/4–5.6, Mega O.I.S.	45-200mm	90-400mm	f/4-5.6
Panasonic	Panasonic Lumix G Vario 100-300mm f/4–5.6, Mega O.I.S.	100-300mm	200-600mm	f/4-5.6
Panasonic	Panasonic Lumix G X Vario PZ 45-175mm f/4–5.6 Asph., Power O.I.S.	45-175mm	90-350mm	f/4-5.6
Panasonic	Panasonic Lumix G X Vario 35-100mm f/2.8, Power O.I.S.	35-100mm	70-200mm	f/2.8	Announced September 17, 2012

Superzoom lenses

Brand	Product Name	Focal Length	35mm EFL	Aperture	Remarks
Olympus	Olympus M.Zuiko Digital ED 14-150mm f/4-5.6	14-150mm	28-300mm	f/4-5.6
Olympus	Olympus M.Zuiko Digital ED 14-150mm f/4-5.6 II	14-150mm	28-300mm	f/4-5.6	Announced February 5, 2015[63]
Panasonic	Panasonic Lumix G Vario HD 14-140mm f/4–5.8 Mega O.I.S.	14-140mm	28-280mm	f/4-5.8
Tamron	Tamron 14-150mm Di III VC f/3.5-5.8 Di III VC (Model C001)	14-150mm	28-300mm	f/3.5-5.8	Announced January 29, 2013
Panasonic	Panasonic Lumix G Vario 14-140mm f/3.5-5.6 Asph. Power O.I.S.	14-140mm	28-280mm	f/3.5-5.6	Announced April 24, 2013.[64]

Fixed focal length lenses

On Jan 9, 2012 Sigma announced its first two lenses for Micro Four Thirds, the "30mm F2.8 EX DN and the 19mm F2.8 EX DN lenses in Micro Four Thirds mounts".^[65] In a press release posted on January 26, 2012, Olympus and Panasonic jointly announced that "ASTRODESIGN, Inc., Kenko Tokina Co., Ltd. and Tamron Co., Ltd. join[ed] the Micro Four Thirds System Standard Group".^[66] On January 26, 2012, Tokina and Tamron have indicated they would be designing lenses for the Micro 4/3 system as well.^[66]

Prime lenses with autofocus

Brand	Product Name	Focal Length	35mm EFL	Max. aperture	Remarks
Olympus	Olympus M.Zuiko Digital ED 12mm f/2	12mm	24mm	f/2	[67]
Olympus	Olympus M.Zuiko Digital 17mm f/2.8	17mm	34mm	f/2.8
Olympus	Olympus M.Zuiko Digital 17mm f/1.8	17mm	34mm	f/1.8
Olympus	Olympus M.Zuiko Digital 25mm f/1.8	25mm	50mm	f/1.8	(announced 27 January 2014)
Olympus	Olympus M.Zuiko Digital ED 45mm f/1.8	45mm	90mm	f/1.8	[68]
Olympus	Olympus M.Zuiko Digital ED 75mm f/1.8	75mm	150mm	f/1.8	(announced 24 May 2012)
Olympus	Olympus M.Zuiko Digital ED 300mm f/4 PRO	300mm	600mm	f/4.0	(announced 12 February 2014
Panasonic	Panasonic Lumix G 14mm f/2.5 Asph.	14mm	28mm	f/2.5
Panasonic	Panasonic Leica DG Summilux 15mm f/1.7 Asph.	15mm	30mm	f/1.7	(announced 17 October 2013)
Panasonic	Panasonic Lumix G 20mm f/1.7 Asph.	20mm	40mm	f/1.7
Panasonic	Panasonic Lumix G 20mm f/1.7 II Asph.	20mm	40mm	f/1.7	(announced 27 June 2013)
Panasonic	Panasonic Lumix G 25mm f/1.7 Asph.	25mm	50mm	f/1.7	(announced 2 September 2015)
Panasonic	Panasonic Leica DG Summilux 25mm f/1.4 Asph.	25mm	50mm	f/1.4	(announced 13 June 2011)
Panasonic	Panasonic Leica DG Nocticron 42.5mm f/1.2	42.5mm	85mm	f/1.2	(announced 1 August 2013)
Panasonic	Panasonic Lumix G 42.5mm f/1.7 Asph. Power O.I.S.	42.5mm	85mm	f/1.7
Panasonic	Panasonic Lumix G 150mm f/2.8	150mm	300mm	f/2.8	(announced September 2012)
Schneider Kreuznach	Schneider Kreuznach Super Angulon 14mm f/2.0	14mm	28mm	f/2.0	(announced 28 September 2012)
Schneider Kreuznach	Schneider Kreuznach Xenon 30mm f/1.4	30mm	60mm	f/1.4	(announced 28 September 2012)
Sigma	Sigma 19mm f2.8 DN	19mm	38mm	f/2.8	(announced 29 January 2013)
Sigma	Sigma 19mm f2.8 EX DN	19mm	38mm	f/2.8	[69]
Sigma	Sigma 30mm f2.8 DN	30mm	60mm	f/2.8	(announced January 29, 2013)
Sigma	Sigma 30mm f2.8 EX DN	30mm	60mm	f/2.8	[70]
Sigma	Sigma 60mm F2.8 DN	60mm	120mm	f/2.8	(announced January 29, 2013)
DJI	DJI 15mm F/1.7 ASPH	15mm	30mm	f/1.7	(announced September, 2015)

Prime lenses without autofocus

Brand	Product Name	Focal Length	35mm EFL	Max. aperture	Remarks
Olympus	Olympus 15mm f/8 Body Cap	15mm	30mm	f/8	Fixed aperture
Cosina Voigtländer	Cosina Voigtländer Nokton 10.5mm f/0.95	10.5mm	21mm	f/0.95	[71]
Cosina Voigtländer	Cosina Voigtländer Nokton 17.5mm f/0.95	17.5mm	35mm	f/0.95	[72]
Cosina Voigtländer	Cosina Voigtländer Nokton 25mm f/0.95	25mm	50mm	f/0.95	[73]
Cosina Voigtländer	Cosina Voigtländer Nokton 42.5mm f/0.95	42.5mm	85mm	f/0.95
SLR Magic	SLR Magic Toy Lens 11mm f/1.4	11mm	22mm	f/1.4
SLR Magic	SLR Magic Toy Lens 26mm f/1.4	26mm	52mm	f/1.4
SLR Magic	SLR Magic 10mm HyperPrime CINE T2.1	10mm	20mm	f/2.1
SLR Magic	SLR Magic HyperPrime CINE 12mm T1.6	12mm	24mm	f/1.6	15 cm minimum focusing distance
SLR Magic	SLR Magic CINE 17mm T1.6	17mm	34mm	f/1.6
SLR Magic	SLR Magic HyperPrime CINE II 25mm T0.95	25mm	50mm	f/0.95
SLR Magic	SLR Magic 35mm CINE Mark II T1.4	35mm	70mm	f/1.4
SLR Magic	SLR Magic 35mm f/1.7	35mm	70mm	f/1.7
SLR Magic	SLR Magic HyperPrime CINE 35mm T0.95	35mm	70mm	f/0.95	APS-H Leica M mount lens with adapter
SLR Magic	SLR Magic ANAMORPHOT-CINE 35mm T2.4	35mm	70mm	f/2.4
SLR Magic	SLR Magic ANAMORPHOT-CINE 50mm T2.8	50mm	100mm	f/2.8
SLR Magic	SLR Magic HyperPrime 50mm f/0.95	50mm	100mm	f/0.95
SLR Magic	SLR Magic APO-HyperPrime 50mm T2.1	50mm	100mm	f/2.1
SLR Magic	SLR Magic ANAMORPHOT-CINE 70mm T4	70mm	140mm	f/4
Handevision	Handevision Ibelux 40mm f/0.85	40mm	80mm	f/0.85	[74]
Jackar	Jackar Snapshooter 34mm f/1.8	34mm	68mm	f/1.8
Meyer Görlitz	Nocturnus 35mm f/0.95	35mm	70mm	f/0.95
Mitakon	Mitakon 24mm f/1.7	24mm	48mm	f/1.7
Mitakon	Mitakon Speedmaster 25mm f/0.95	25mm	50mm	f/0.95
Mitakon	Mitakon Speedmaster 35mm f/0.95	35mm	70mm	f/0.95
Mitakon	Mitakon 42.5mm f/1.2	42.5mm	85mm	f/1.2
Tokina	Tokina Reflex 300mm f/6.3 MF Macro	300mm	600mm	f/6.3
Kowa	Kowa Prominar 8.5mm f/2.8 MFT	8.5mm	17mm	f/2.8
Kowa	Kowa Prominar 12mm f/1.8 MFT	12mm	24mm	f/1.8
Kowa	Kowa Prominar 25mm f/1.8 MFT	25mm	50mm	f/1.8
Samyang	Samyang 10mm f/2.8 ED AS NCS CS	10mm	20mm	f/2.8	Also sold under Rokinon brand name.
Samyang	Samyang 12mm f/2.0 NCS CS	12mm	24mm	f/2.0	Also sold under Rokinon brand name.
Samyang	Rokinon 16mm f/2.0 ED AS UMC CS	16mm	32mm	f/2.0
Samyang	Rokinon 21mm f/1.4	21mm	42mm	f/1.4	CINE versions available.
Samyang	Samyang 24mm f/1.4 ED AS IF UMC	24mm	48mm	f/1.4	Also sold under Rokinon brand name.
Samyang	Samyang 35mm f/1.4 AS UMC	35mm	70mm	f/1.4	Also sold under Rokinon brand name.
Samyang	Rokinon 50mm f/1.2	50mm	100mm	f/1.2	CINE versions available.
Samyang	Rokinon 85mm f/1.4 AS IF UMC	85mm	170mm	f/1.4
Samyang	Rokinon 135mm f/2.0 ED UMC	135mm	270mm	f/2.0
Samyang	Rokinon Reflex 300mm f/6.3 ED UMC CS	300mm	600mm	f/6.3
Veydra	Veydra Mini Prime 12mm T2.2	12mm	24mm	f/2.2
Veydra	Veydra Mini Prime 16mm T2.2	16mm	32mm	f/2.2
Veydra	Veydra Mini Prime 25mm T2.2	25mm	50mm	f/2.2
Veydra	Veydra Mini Prime 35mm T2.2	35mm	70mm	f/2.2
Veydra	Veydra Mini Prime 50mm T2.2	50mm	100mm	f/2.2
Veydra	Veydra Mini Prime 85mm T2.2	85mm	170mm	f/2.2	(announced April 12, 2015)
Veydra	Veydra Mini Anamorphic 2X 25mm T2.2	25mm	50mm	f/2.2	(announced April 12, 2015)

Macro lenses

Brand	Product Name	Focal Length	35mm EFL	Max. aperture	Remarks
Panasonic	Panasonic Leica DG Macro-Elmarit 45mm f/2.8 Asph.	45mm	90mm	f/2.8
Panasonic	Panasonic Lumix G Macro 30mm f/2.8 MEGA O.I.S	30mm	60mm	f/2.8
Olympus	Olympus M.Zuiko Digital ED 60mm f/2.8 Macro	60mm	120mm	f/2.8
Schneider Kreuznach	Schneider Kreuznach Makro-Symmar 60mm f/2.4	60mm	120mm	f/2.4	(announced 28 September 2012)

Fisheyes

Brand	Product Name	Focal Length	35mm EFL	Max. aperture	Remarks
Olympus	Olympus M.Zuiko Digital ED 8mm f/1.8 Fisheye PRO	8mm	16mm	f/1.8	2.5 cm minimum focus distance (announced 14 May 2015)
Olympus	Olympus 9mm f/8 Fisheye Body Cap	9mm	18mm	f/8.0	Fixed aperture
Panasonic	Panasonic Lumix G Fisheye 8mm f/3.5	8mm	16mm	f/3.5	[75]
Samyang	Samyang 7.5mm f/3.5 UMC Fish-eye MFT	7.5mm	15mm	f/3.5	Manual focus. Also sold under Wallimex, Bower, and Rokinon brand names[76]
Samyang	Rokinon 8mm f/3.5 UMC Fisheye CS II	8mm	16mm	f/3.5
Samyang	Rokinon 9mm f/8.0 RMC	9mm	18mm	f/8.0

3D lenses

• Panasonic Lumix G 12.5mm 3D lens f/12 (35mm EFL = 65mm) when using 16:9 format on Panasonic Lumix DMC-GH2. This lens is only compatible with newer Panasonic bodies and the Olympus OMD E-M5. Not compatible with Panasonic Lumix DMC G-1, GF-1 and GH-1. Not compatible with any Olympus PEN digital cameras.

Digiscoping lenses

• SLR Magic 12-36x50 ED spotting scope for micro four thirds f/8-25 (announced September 2011)(35mm EFL = 840-2520mm)^[77]

Pinhole

• SLR Magic x Toy Lens Pinhole f/128 'lens' cap (announced March 2012)(35mm EFL = 12mm)^[78]
• Wanderlust Pinwide f/96 - f/128 'lens' cap^[79]

3D

On July 27, 2010 Panasonic has announced the development of a three-dimensional optic solution for the Micro Four Thirds system. A specially designed lens allows it to capture stereo images compatible with VIERA 3D-TV-sets and Blu-ray 3D Disc Players.^[80]

See also

• Image sensor format
• Lenses for SLR and DSLR cameras
• List of lens mounts

Notes

References

• The Micro Four Thirds Standard official pages.

External links

Media related to Micro Four Thirds system cameras at Wikimedia Commons

• Complete Micro 4/3 Lens List.
• Panasonic Lumix G family of lenses
• Olympus PEN system lenses
• Cosina Voigtländer Nokton MFT mount product Page
• Noktor Hyperprime MFT mount product page
• Samyang Fisheye product page

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