The Canon 20D accepts the EF, EF-S and L series lens.
The Canon 20D is a feature packed semi-professional camera body and accepts all of Canon's electronic focus (EF) lenses. Canon has over 60 lenses ranging from as wide as 14 mm to a 1,200 mm telephoto. There are also third party alternatives manufactured by Sigma, Tokina and Tamron. These lenses, when used with a Canon adapter, will also fit the 20D.
Understanding Crop Factor
Your Canon 20D uses an APS-C sensor. This sensor is smaller than a 35 mm negative, which focal lengths are based on. The smaller sensor increases the focal length by 1.6x. Using a 50 mm lens as an example, the Canon 20D effective focal length is 80 mm (50 mm x 1.6). The new focal length is referring to field of view, the area the lens covers, and is not an increase in magnification of the lens.
Wide, Normal and Telephoto Lenses
All three types of lens will work on a Canon 20D. A wide-angle lens is designed to capture sweeping landscapes, as well as large areas of a room where space is limited. This lens has a focal length ranging from 16 mm to 35 mm.
A normal lens has a focal length of 50 mm, and roughly recreates the same perspective as a human eye. Normal lenses are good for a close, but not a macro, view of most subjects.
Telephoto lenses are similar to telescopes. They make the subject appear closer. Telephotos have a number of applications, but are most commonly used for sports, wildlife or other events where it is difficult to get close to the subject.
What Type of Lens Should I Buy?
Selecting a lens for your Canon 20D will be determined by the type of photography you plan on shooting. Like cameras, lenses are available at many different prices. The difference in cost will often account for the quality of the glass used and the overall construction of the lens.
Canon's professional grade of lens is the L-Series. These lenses are viewed as some of the best in the industry. They boast enhanced optics and weather-resistant seals. Considerably more expensive than standard lenses, they may not offer enough value to justify their cost. A good mid-range lens is the 24-85 mm 3.5-4.5USM lens. This focal length covers a majority of general photography requirements.
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