It's a bird

by Vian Esterhuizen

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Most of the answers above are misleading. A Canon APC sensor has a crop factor of 1.6 which effectively changes the focal length by 1.6, therefore a 100mm lens has an effective length of 160mm. A simple exercise is to use the same lens on two difference bodies, one full frame and one cropped and you will instantly see the difference. You cannot use a full ...

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