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Not 100% equivalent, but from what I’ve heard, this can be an issue when using full frame lenses on a crop sensor DSLR. The sensor gets everything from a smaller part of the lens, so defects that don’t show on a 35mm equivalent sensor can show at APS-C.


When you use a full-frame lens on a crop sensor:

* Vignetting always improves

* First-order distortion improves, second-order distortion sometimes gets worse.

* Corner sharpness usually improves, unless midway out on the frame was the weakest performance on full frame.

* Center sharpness (image-scale) drops due to the additional enlargement.

* Lateral chromatic aberration generally doesn't get significantly better or worse.

* Longitudinal chromatic aberration becomes more visible because of the additional enlargement.




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