Canon calls this the Canon Zoom Lens EF 17-40mm f/4 L USM. This means: EF: Electronic Focus. All modern Canon lenses do this. L: Expensive. USM: Ultra-Sonic Motor: It focuses silently. Focal Length: 17-40mm. Used on a 1.3x camera it gives angles of view similar to what a 21-50mm lens would give on a 35mm film camera.. In-Depth Review. Because it is a very high quality but moderately-priced ultra wide angle zoom lens, the Canon EF 17-40mm f/4L USM Lens is one of Canon's best selling lenses. The 17-40 f/4L fills out the bottom focal length range of Canon's f/4L zoom lens series . It is the lightest L lens currently made (1.1 lbs / 475g) and is the smallest L.

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The EF 17-40mm f/4L USM acts as an ultra-wide angle zoom on film or full-frame digital EOS cameras. On DSLRs equipped with APS-C sized sensors it acts as a standard zoom, giving an angle of view equivalent to a 28-70mm lens on a full-frame camera.. Canon EF 17-40mm f/4L USM Ratings & Reviews . Related Accessories Lens Accessory. Extension.. Optical coatings optimized for digital cameras Close focus to 11 inches Super UD and three Aspherical lens elements ensure superior image quality Dust- and moisture-resistant, constructed for professional use