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Since the first APS-C sized imagers appeared in DSLRs a few years ago, photographers have struggled with not having lenses which can provide super-wide angle coverage. With a 1.6X factor, (on Canon DSLRs, at least), a 16mm focal length, like that of Canon's 16-35mm zoom, becomes just 25mm at the wide end.
Recently a number of even wider-angle lenses have become available, and the latest of this batch, at least for owners of the Canon 20D and Rebel, is the recently announcedCanon EF-S 10-22mm f/3.5-4.5 USM. This lens is the equivalent on a reduced frame camera of a 16-35mm in full-frame terms.
Keep in mind though that the 10-22mm is anEF-Slens, which means that its designed to only cover th...

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Michael Reichmann is the founder of the Luminous Landscape. Michael passed away in May 2016. Since its inception in 1999 LuLa has become the world's largest site devoted to the art, craft, and technology of photography. Each month more than one million people from every country on the globe visit LuLa.
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