Possible Duplicate: Does my crop sensor camera actually turn my lenses into a longer focal length? My wife has a pair of Tokina lens (28-80mm and 100-300mm, I believe, without the lens here ...
What do the different sensor size names used by Canon mean? There's APS-C, APS-H and full format? What are the standards used by Nikon, Pentax, Sony, Olympus, Panasonic, and others? What are the ...
Possible Duplicate: What is the difference between focal length and crop factor? I see the term "crop factor" used to describe some DSLRs (for example, the Canon 7D has a 1.6x crop factor). ...