20d Camera Canon Digital Slr

The Canon EOS 20D is an 8.2-megapixel semi-professional digital single-lens reflex camera, initially announced on August 19, 2004 at a recommended retail price of US$1,499. 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 more megapixels (8.2 megapixels instead of 6.3) and retains the 1.6 crop factor. It 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 February 14, 2005 in Japan. It is a variant of the 20D designed for astrophotography. On June 1, 2005 Canon announced that the 20Da would be made available world-wide.

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.

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 astrophotography, 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. A separate IR filter must be attached to the lens in order to use the 20Da to capture images similar to those seen by the human eye.

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.

There were reports that the camera did not perform up to expectations, and had problems with image noise, but was capable of outstanding images.

The EOS 20Da was discontinued when the 30D was introduced in 2006. Canon has produced no similar model for astrophotography since, though many astrophotographers commonly make similar aftermarket modifications to later Canon models to fill the same role.

Firmware

The latest firmware available for the 20D (and believed to be the final update) is version 2.0.3, made available August 23, 2005, which improves the communication reliability with some CF cards and other minor changes.

Gallery

References

1. ^ "Canon EOS 20Da for the rest of us". dpreview.com. June 1, 2005 . http://www.dpreview.com/news/0506/05060101canon20da.asp . Retrieved 2009-11-19 .  
2. ^ "Canon EOS 20Da DSLR". Bob Atkins Photography. Feb 15, 2005 . http://www.bobatkins.com/photography/digital/eos20da.html . Retrieved 2009-11-19 .  
3. ^ "Wanting to buy a Canon EOS 20Da Digital Camera". Astronomy.com Forums . http://cs.astronomy.com/asycs/forums/t/37430.aspx . Retrieved 2009-11-19 .  
4. ^ Raymond, Emily (April 10, 2006). "Canon to Discontinue EOS 20Da". DigitalCameraInfo.com . http://www.digitalcamerainfo.com/content/Canon-to-Discontinue-EOS-20Da-.htm . Retrieved 2009-11-19 .  

External links

• Canon EOS 20D Specifications

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8.2-megapixel sensor captures 3504 by 2336 pixel JPEG or RAW images; Body only, EF mount compatible with all Canon lenses in EF and EF-S lineup

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Canon EOS 20D Digital SLR Camera - Canon UK

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EOS (SLR) Camera Systems - EOS Digital SLR Cameras - EOS 35mm SLR ...

Consumer Products Home:: Camera:: EOS (SLR) Camera Systems:: EOS 20D ... © 2009 Canon U.S.A., Inc. All rights reserved. Duplication in whole or in part ...

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Canon Eos 20D Digital SLR Lens Kit: Amazon.co.uk: Electronics & Photo

5.0 out of 5 stars EOS 20D is the best ever Canon body for under 1000 pounds From my first purchase and experience of a digital camera, SLR or otherwise, I can honestly say that this ...

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http://www.qando.net/ - Digital Camera Review: Canon EOS 20D Digital ...

The Canon EOS 20D Digital SLR. At 8 megapixels, and a sticker price of $1,599, the 20D is designed to bridge that gap by providing a camera that can give you photo-quality 16"x20 ...

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Canon EOS 20D Digital SLR Camera - Canon Ireland

The EOS 20D is the semi-professional digital SLR to deliver all the speed, precision and flexibility synonymous with high-end film SLR cameras - plus a whole lot more.

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Canon | EOS 20D Digital Camera (Camera Body) | 9442A002 | B&H

Canon EOS 20D, 8.2 Megapixel, SLR, Digital Camera (Camera Body) B&H# CAE20D Mfr# 9442A002

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Canon EOS 20D Digital Camera SLR Review - PC World

Review of the Canon EOS 20D Digital Camera SLR from PC World.

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