Sony Alpha 7

Sony ILCE-7

Type	Mirrorless interchangeable lens camera
Sensor	35.8 x 23.9mm Exmor full-frame HD CMOS Sensor
Maximum resolution	6000 x 4000 (3:2) (24 megapixels)[1]
Lens	Sony E-mount
Shutter	Electronically-controlled, vertical-traverse, focal-plane shutter
Shutter speed range	1/8000 - 30 sec, BULB
ASA/ISO range	Auto, 100-25600
Exposure metering	Multi-segment, Center-weighted, Spot
Focus modes	Contrast Detect (sensor), Phase Detect, Multi-area, Center, Selective single-point, Single, Continuous, Face Detection, Live View
Continuous shooting	5 frame/s
Viewfinder	Built-in 2.4 million dots OLED Electronic viewfinder
Rear LCD monitor	3.0 in (76 mm) Tilting XtraFine LCD, 1,230,000 pixels
Storage	Memory Stick Pro Duo, Pro-HG Duo, SD, SDHC, SDXC
Battery	NP-FW50, InfoLITHIUM, 7.2 V, 1080 mAh, 7.7 Wh, Lithium-Ion rechargeable battery
Dimensions	127 x 94 x 48 mm
Weight	Approx. 474 g (16.7 oz) (camera body, card and battery)

The Sony ILCE-7, ILCE-7R and ILCE-7S (α7/α7R/α7S) are three closely related digital cameras. The first two were announced on 16 October 2013^[2] and the third on 6 April 2014. Externally they are identical except for the model number. They are Sony’s first full-frame mirrorless interchangeable lens cameras and share the E-mount with the company’s smaller sensor NEX series. The ILCE-7m2 (α7II) was announced in November 2014, and is the first in the family to revise the original body and ergonomics. The a7 series is targeted at experienced users, enthusiasts and professionals.^[3]

Sony's new model naming prefix strives to unify model names. “ILC” indicates Interchangeable Lens Camera followed by an indicator of A-mount “A” or E-mount “E”^[4]

The products are more commonly known as the α7, α7R and α7S. Pre-announcement rumours speculated that the new camera would be named Sony NEX-9.^[5]

Although the α7 series uses full-frame sensors and have a DSLR-shaped design, their sizes and weights are less than Olympus OM-D E-M1 with its small micro four thirds sensor and can also be compared with the lightest Fullframe DSLR.^[6] Compared to the smallest and lightest APS-C DSLR Canon EOS 100D, the α7 is 67 grams heavier and a bit larger, but the thickness is only two thirds of Canon's.^[7] The α7 price is significantly lower than a comparative Fullframe DSLR price, but still higher than that of a low or mid-end compact camera price.^[8] Compared to the Nikon D800E, the weight of Sony α7R is only about a half and the price is about two-thirds.^[9]

Variations

There are four different models available in the α7-series. They are the α7, α7R, α7S and α7II.

The basic 'α7' model has 24MP and fast hybrid-autofocus.

The 'R' model is the 36MP "resolution" version of the series with a new, higher-density sensor design, and priced $600 more than the α7 at launch, but has no optical low-pass filter as the sibling has. However, the α7R does not include the faster hybrid auto-focus system found on the base model.

The 'S' model is a high sensitivity version of the series with an effective ISO range from 100 to 409600 and with 4K video capability, but only 12MP.

The α7II model uses the same sensor (with minor tweaks) as the original α7, but significantly revises the external ergonomics and adds Image Stabilization as the world's first 5-axis sensor-shift image stabilisation system for a full-frame ILC. Sony claimed that this can compensate a 4.5-stop equivalent of camera shake. In-body stabilization requires no special lens features, and mirrorless system cameras can typically accommodate lenses from any SLR system.^[10][11] As an upgrade of the α7, the α7II has the same 50Mbit XAVC-S codec as the α7S but lacks 4K video, and the 5 axis stabilisation is less effective in video mode than that used in the Olympus OM-D E-M1.^[12] However, the crop mode used in the α7II does not incur "very much loss in image quality", unlike that of the Nikon D750.^[12]

Model differences

Features (universal for α7-series)

• Exmor CMOS full-frame sensor (With different megapixels depending on camera version)
• TruBlack XtraFine LCD screen (3"/ 7,5 cm) with 921.6K dots resolution with tilt functionality.
• 1.3 cm (0.5inch) Electronic Viewfinder.
• 1200-zone evaluative light metering.
• Built-in Wi-Fi and NFC.
• LED-auto focus illuminator.
• Multi Interface Shoe.
• 9 customizable buttons and 45 assignable functions.

Reception

The cameras received positive reception from the critics. DxOMark crowned the α7R as the highest full-frame with sensor quality by a mirrorless camera with the score of 95 and has same score with Nikon D800, but one point behind of Nikon D800E,^[13] while the α7 has score of 90 and better than Nikon Df, Nikon D4 professional DSLR camera and Sony SLT-A99.^[14] The Verge rated the cameras 8.3 out of 10 commenting that "It might be a few years before we realize it, but when the DSLR is relegated to a niche status among specialty photographers and full-frame mirrorless cameras dominate the market, we’ll have the α7s to thank as the cameras that started it all."^[15] EPhotozine which rated the α7 5 stars, meanwhile praised the α7's price for being "the cheapest full-frame digital cameras currently available" while being lighter and smaller than comparable cameras.^[16] It awarded the α7 as the "Camera of the Year."^[17] The α7R was awarded by Imaging Resource as the "Camera of the Year".^[18]

References

Wikimedia Commons has media related to Sony ILCE-7.