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0 30150 4/20/2006
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  • 8.2-megapixel CMOS sensor, 3,504 x 2,336 pixel images
  • ISO of 50, 100, 200, 400, 800, 1600, 3200 with enhanced noise reduction
  • Modified low-pass filter optimized for astrophotography
  • 1.8 inch LCD monitor with magnified live-view mode

(From company literature) Designed especially for photographers who want to capture galaxies far, far away the EOS 20Da camera delivers outstanding photos of the night sky. Most features of the EOS 20Da are shared with the standard EOS 20D camera but several important modifications have been made to optimize the camera's astrophotography capabilities.

The EOS 20Da yields sharper and higher contrast images of various astronomical phenomena such as diffuse reddish nebulae because of a special, modified low-pass filter that is positioned in front of the EOS 20Da's 8.2 Megapixel CMOS sensor. The modification increases the transmission of light at the specific wavelength of 656nm, known as the Hydrogen Alpha line or Ha wavelength, by a factor of 2.5x compared to the standard EOS 20D.

The 20Da makes framing the image easier with a magnified live view mode on the 1.8" LCD monitor. This is not possible with traditional digital SLRs, but the 20Da allows the photographer to lockup the mirror and open the shutter at night to view subjects before the image is captured. The central portion of the image is magnified by 5x or 10x to ensure sharp focus. The live view mode can also be used with a TV monitor connected to the camera's video out terminal.

For the long exposures required in astrophotography, the EOS 20Da features enhanced noise reduction incorporating an optimized CMOS control system. A custom function is also available for noise reduction allowing the user to achieve maximum image quality at ISO settings from 50-3200.

The EOS 20Da can be connected to a telescope using a standard, widely available T-mount, thus enabling incredible images of distant subjects that are normally invisible to the naked eye. In addition, the camera is also compatible with over 50 EF and EF-S lenses, including Canon's renowned Image Stabilizer super-telephoto lenses. Conventional photography is also possible by mounting an infrared filter on the lens.

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Keywords: Canon SLR CF APS-C 8MP Astrophotography


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