Reviews and Problems with Canon EF-S 15-85mm f/3.5-5.6 IS USM
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Canon EF-S 15-85mm f/3.5-5.6 IS USM Lens
The Digital Picture
9 September 2009
Excerpt: Like all Canon EF-S Lenses , the 15-85 IS mounts only to EF-S compatible Canon bodies - more specifically, only those with APS-C sized sensors. APS-C sensors have a FOVCF of 1.6x. Multiplying the 15-85's focal length range by 1.6x shows that the 15-85 mounted on an APS-C body will deliver a 35mm angle of view equivalent of 24-136mm. This focal length range completely encompasses and extends what I consider the general purpose range.