Understanding effective focal length for EF-S lenses

Started Feb 20, 2009 | Discussions thread
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JoeWB
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Understanding effective focal length for EF-S lenses
Feb 20, 2009

Do the focal lengths of the EF-S lenses take into condsideration the 1.6 crop factor. For example, is the 17-55 EF-S lens effectiverly 17mm at the wide end on the 50D, or is it effectively 27.2 (17*1.6)?

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