The Tamron Focal Length Comparison Tool simulates the effect of changes in focal length. This tool is particularly useful to experience the range of versatility of various zooms lenses—offering a practical sense of the perspectives you can expect. In addition, the tool allows you to see the difference in resultant angle of view when using a given focal length on 35mm film or full-frame sensor DSLRs or DSLRs with smaller (APS-C-sized) sensors—often referred to as a crop factor or a focal length equivalent.
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http://www.tamron-usa.com/lenses/learning_center/tools/focal-length-comparison.php
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