The Canon EOS 40D

The Canon EOS 40D is the successor to the 30D, which was the successor to the hugely popular EOS 20D, and is without question one of the most popular dSLRs of all time. The 20D is responsible for many of the recent converts to the Canon system. The 40D features Canon’s proven 10.1.-megapixel CMOS sensor with a 1.6x conversion factor, combined with the speed and intelligence of the DIGIC III Image Processor. With the 40D, several more professional features were added, including a magnesium body, a heavy-duty shutter rated for 100,000 plus actuations, true spot metering, and the incorporation of the Picture Styles technology.

The camera controls and the menu are intuitive and easy to use. Even for those who have never used a dSLR, this camera will make you a fast learner. It’s a snap to change modes, ISO, white balance, and so on; and the large, bright three-inch LCD makes menu choices and image review a pleasure. The 40D is lightweight compared to many dSLRs but still maintains good build quality with its magnesium construction. Although the camera isn’t marketed as being weatherproof, it does have upgraded weather and dust seals. I have been caught by a fast-moving thunderstorm on a bald mountaintop, and although the camera did get wet, it was no worse for wear. I dried it off and kept on shooting.

The 40D accepts the complete line of Canon EF mount lenses, as well as the EF-S mount lenses designed for non-full-frame Canon digital cameras. The 40D also sports user-selectable highspeed or low-speed continuous shooting at 6.5 fps or 3 fps with a fast 0.15-second startup time.

Here are the CanonĀ EOS 40D specifications at a glance:

  • 10.1-megapixel CMOS APS-C sensor
  • 6.5 fps continuous shooting
  • Buffer/maximum burst of 75 large JPEG images, 17 RAW
  • 3-inch, high-resolution LCD screen
  • High-precision, 9-point wide-area AF
  • Customizable Picture Styles
  • DIGIC III Image Processor
  • ISO range: 100-1600; expandable to 3200
  • Shutter durability of 100,000 actuations
  • Magnesium alloy body
  • USB 2.0 Hi-Speed and Video Out interface
  • Compatible with all Canon EF and EF-S lenses, Speedlite EX flashes
  • Supports wireless file transmitter WFT-E3A


Outside the USA, Canon sometimes uses different model numbers for the same camera. The Rebel XTi is the EOS 400D in some countries. The XSi is the 450D.


If an image sensor is full-frame, it is the equivalent to a 35mm frame of film that uses 100 percent of a lens’s potential. Most sensors, however, are smaller than full-frame, so a conversion factor indicates how this affects the smaller area the lens is taking in. For example, if you use a 50mm lens on a camera with an image sensor with a 1.6 conversion factor, it would act like an 80mm lens in terms of its full angle of view and the amount of focal width you have in your photograph (1.6 x 50mm = 80mm).

Category: Canon dSLR lineup

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