Wide-angle lenses offer a wide view of a scene. Lenses shorter than 50mm are commonly considered wide angle on full-frame 35mm image sensors. For example, 16mm and 24mm lenses are wide angle. A wide-angle lens also offers sharp detail from foreground to background, especially at narrow apertures such as f/22. The amount of reasonably sharp focus front to back in an image is referred to as depth of field.
6.2 As a result of the focal length multiplication factor on the 40D, less of the scene is included than would be on a full-frame camera, and the distortion of the wide-angle lens is evident. Exposure: ISO 100, f/10, 1/250 sec. using a Canon EF 16-35mm f/2.8L USM lens.
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