Monday, April 20, 2015
Why Crop Sensor Lenses don't work on Full Frame Cameras
So, why?
The main reason is because of the image circle. It's easier to illustrate.
A full frame sensor is bigger than the image circle produced by a crop lens. Hence, you would often get vignetting or ridiculously soft images at the edges.
A full frame lens produces an image circle that fits a full frame sensor. Since it's bigger than the edges of a crop sensor as well, there would be no problem using it on a crop.
For Canon users, there is another reason. EF-S lenses and EF lenses have a different mounting index. EF-S lenses actually have protruding rears, to take advantage of the shorter possible flange distance on a crop camera. You cannot mount an EF-S lens to a full frame Canon body.
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