Canon EOS 20D
 | |
| Type | Single-lens reflex |
|---|---|
| Sensor | 22.5 mm × 15.0 mm CMOS |
| Maximum resolution | 3,520 × 2,344 (8.25 megapixels) |
| Lens | Interchangeable (EF EF-S) |
| Flash | Auto pop-up E-TTL II (retractable) |
| Shutter | Vertical travel, focal-plane shutter, all speeds electronically controlled |
| Shutter speed range | 1/8,000 to 30 s, bulb |
| Exposure metering | TTL full aperture, 35 area evaluative, partial, center-weighted |
| Exposure modes | Full auto, programmed, shutter-priority, aperture priority, manual |
| Metering modes | Evaluative, Partial, C/Wgt Average |
| Focus areas | 9 autofocus points |
| Focus modes | One-shot, AI servo, AI Focus, Manual |
| Continuous shooting | 5.0 frame/s, up to 23 frames (6 in RAW) |
| Viewfinder | Optical, pentaprism |
| ASA/ISO range | 100–1600 in 1 EV steps, 3200 in extended mode |
| Flash bracketing | none |
| Focus bracketing | none |
| Custom WB | 7 presets, Auto and custom |
| WB bracketing | ±3 stops, blue-amber or magenta-green bias |
| Rear LCD monitor | 1.8 in (46 mm), 118,000 pixels |
| Storage | CompactFlash (CF) (Type I or Type II) and Microdrive (MD) / max 8GB (The camera can format up to 8GB, but can use larger cards. [citation needed]) |
| Battery | Main battery Li-Ion BP-511A rechargeable battery pack; internal memory battery CR2016 supports clock, frame counter |
| Dimensions | 144 x 105.5 x 71.5 mm |
| Weight | 685 g (body only) |
| Optional battery packs | Li-Ion BP-511A, BP-511, BP-512, BP-514AC and optional DC coupler. |
| Made in | Japan |
The Canon EOS 20D is an 8.2-megapixel semi-professional digital single-lens reflex camera, initially announced on 19 August 2004 at a recommended retail price of US$1,499.[1] It is the successor of the EOS 10D, and was succeeded by the EOS 30D in August 2006. It accepts EF and EF-S lenses and uses an APS-C sized image sensor.
Improvements
The 20D features a new sensor and a greater megapixel count (8.2 megapixels instead of 6.3) and retains the Canon 1.6x crop factor. The 20D supports USB 2.0. The 20D has a larger buffer and can shoot more frames per second. It also uses the E-TTL II flash metering system and uses the DIGIC II image processor.
The EOS 20D (with appropriate firmware updates) can also accept the Canon Wireless File Transmitter WFT-E1/E1A for fast file transfer to a remote file server, either through an ethernet cable or a Wi-Fi network.
Features
The 20D is the first Canon prosumer camera to use the EF-S lens mount; the first Canon EOS camera to use the mount was the 300D (the Digital Rebel in North America).
EOS 20Da
Canon released the EOS 20Da on 14 February 2005 in Japan. It is a variant of the 20D designed for astrophotography. On 1 June 2005 Canon announced that the 20Da would be made available worldwide.[2]
The main differences between the 20Da and 20D are the replacement of the "hot mirror" infra-red (IR) filter which covers the CMOS sensor on the 20D and live view mode.[3]
In conventional photography, the IR filter is used to make the spectral response of the CMOS sensor more like that of the human eye. In this way, the pictures gathered by the sensor more closely resemble the world as we see it. In astro-photography, many objects of interest emit strongly in the red H-α line, which is heavily attenuated by the IR filter on the 20D. The IR filter of the 20Da passes 2.5 times more light at around this 656 nm wavelength as the filter of the 20D, allowing more fine detail to be revealed in long exposures of emission nebulae. As a side effect, the color balance is slightly altered in normal daylight photography.
It is extremely difficult to focus an extremely dim image with a reflex viewfinder; locking the mirror up and opening the shutter (live view) was introduced in the 20Da to address this issue. When used the camera provides a live image of the center of the field of view to allow focusing on a bright star. Live view for this application requires a lens which supports fully mechanical focus in manual mode, and is not suitable for normal daytime use.
Reviews report that image noise in the 20Da is lower than in the 20D,[4] and equivalent to that of the 5D MkII.[5]
The EOS 20Da was discontinued when the 30D was introduced in 2006.[6] Canon produced no similar model for astrophotography for years, resulting in many astrophotographers making similar aftermarket modifications to later Canon models.
In April 2012, Canon announced the EOS 60Da which is the successor to the EOS 20Da.[7]
Firmware
The latest firmware available for the 20D (and believed to be the final update) is version 2.0.3, made available 23 August 2005, which improves the communication reliability with some CF cards and other minor changes.
References
- ↑ "Canon EOS 20D Review". dpreview.com. November 2004. Retrieved 4 March 2011.
- ↑ "Canon EOS 20Da for the rest of us". dpreview.com. 1 June 2005. Retrieved 19 November 2009.
- ↑ "Canon EOS 20Da DSLR". Bob Atkins Photography. 15 February 2005. Retrieved 19 November 2009.
- ↑ Lodriguss, Jerry. "Canon 20Da First Starlight". astropix.com.
- ↑ Dyer, Alan (September 2012). "The 60Da: Canon's Astrophoto DSLR". Sky & Telescope 124 (3): 38–41. ISSN 0037-6604.
- ↑ Raymond, Emily (10 April 2006). "Canon to Discontinue EOS 20Da". DigitalCameraInfo.com. Retrieved 19 November 2009.
- ↑ "New Canon EOS 60Da DSLR Camera For Astronomy Enthusiasts Captures The True Colors Of The Cosmos". Retrieved 3 April 2012.
External links
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