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Forum: Pentax K-5 & K-5 II 09-07-2012, 05:56 AM  
100mm F2.8 Macro image size?
Posted By TER-OR
Replies: 8
Views: 1,452
Simply put, since the image sensor is smaller it percieves less of the light delivered by the FF lens. This would be like using a 150mm lens. However, you do NOT get extra magnification just by mounting a FF lens on a crop sensor - it's still 100mm. The 100mm macros are still great lenses for insects and other items which need a little "stand-off" distance.
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