Canon EOS 40D Digital SLR Camera is a digital single lens reflex camera that combines the characteristics of a traditional digital SLR and new technologies. It has 10.1 megapixel CMOS sensor with APC-S size. It was released after Canon EOS 30D and before Canon EOS 50D. It is compatible with Canons EF and EF-S lenses.

It features a huge APS-C size sensor having the same 3:2 ratio as that of the film cameras. Equipped with Canons CMOS (complementary metal oxide semiconductor) sensor, it produces superb quality images. The sensor enables an effective angle of view that is 1.6x the normal EF lens focal length. It offers the most pixels in its class

The Canon EOS 40D digital SLR camera features the powerful Live View function, which enables you to view your subject on the 3.0-inch LCD monitor. The Live View Function has new options for reduced shutter time lag and quiet operation. It allows you to magnify any part of the scene 5x or 10x for precise manual focus. This function can be used remotely via computer or wirelessly or via Ethernet with the Wireless File Transmitter WFT-E3A attached.

It also features 14-bit A/D conversion, which reduces digital and shadow noise and helps to enhance image tones. Its extensive ISO, which is selectable in 1/3 stop increments, ranges from 100 to 1600. You can extend the sensitivity up to 3200.

Designed with the latest-generation DIGIC III image processor that is powerful and fast, performance between the capture and recording stages of digital photography is maximized. It offers a burst rate up to 75 consecutive JPEGs or 17 RAW images with superior color and reduced digital noise. DIGIC III image processor is faster, more powerful and gives the camera its incredible combination of speed and image quality. It works together with Canon's CMOS sensor to achieve even higher levels of performance.

Canon EOS 40D digital SLR camera is equipped with the new on-chip noise reduction electronics. Combined with the sensor's general design and better high-ISO performance, it produces large high-quality images with less digital noise. With its new manufacturing techniques, each pixel is more sensitive to light and less area between pixels is wasted on the sensor.

It is the world's first 9-point wide area AF SLR where both lines of a cross-type sensor offer high-precision AF coverage. It is the first in Canon to have diagonal high-precision cross-type AF at center point with f/2.8 and faster lenses.

With its 9-point wide area Auto Focus, the camera is able to focus faster, more accurately, and in even more complex lighting. When fast lenses (f/2.8 or faster) are used, the cross-type sensor at the center AF point is sensitive to both vertical and horizontal lines. The wide-aperture lenses are added with even more accuracy and precision. All the focus points are accessible either automatically or through the cameras intuitive, thumb operated Multi-Controller.

With its ability to shoot up to 6.5 frames per second, it is considered to be the fastest digital SLR cameras. You can capture even up to 75 JPEGs or 17 RAW images in one burst. Its startup time takes only 0.15 second and its shutter lag time only takes 59 milliseconds. Also, it features high-speed mirror drive and predictive AF focusing. This camera is ideal for everything from wildlife to sports.

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