Canon EOS 40D Photo Attribution: by 103momo, http://commons.wikimedia.org/wiki/Image:Canon_EOS_40D.jpg, used under GNU Free Documentation License.
The Canon EOS 40D is a 10.1-megapixel semi-professional digital single-lens reflex camera. It was announced on August 20, 2007, and released at the end of August 2007. The EOS 40D replaces the EOS 30D. It accepts EF and EF-S lenses, and like its the EOS 30D, it uses an APS-C sized image sensor, resulting in a 1.6x FOVCF or Field of View Crop Factor (otherwise referred to as focal length multiplier).
Improvements over the Canon EOS 30D include a higher-resolution sensor that retains the same dimensions and 1.6 crop factor relative to full-frame 35mm format. Although the sensor is based on the entry-level Canon EOS 400D, improvement to microlenses allows noise levels to be kept as low as that of the EOS 30D, which is much lower than that of the 400D. The LCD rear screen size is further increased to 3.0 inches from 2.5 inches.
The EOS 40D uses the same diamond layout of nine autofocus points as the 30D and 20D, but has a new AF sensor with nine cross-type points (up from one). It can record in three formats, JPEG, RAW and Canon's own new sRAW format which reduces images size to 2.5 megapixels. The viewfinder magnification has been increased by approximately 5% over that of the 30D. In addition, the viewfinder has been modified to display the current ISO setting and alert the user when shooting in black & white mode.
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