Does adapting a full-frame or APS-C fisheye to Micro Four Thirds reduce the fisheye effect?
Asked 4/7/2014
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If I adapt a fisheye lens designed for a larger format (full-frame or APS-C) onto a Micro Four Thirds camera, the smaller sensor only uses the center of the lens image. Since fisheye distortion is most pronounced toward the edges, does the smaller sensor crop away some or most of the fisheye look? Or does an equivalent fisheye effect still carry over on MFT?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
12y ago
2 Answers
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You will crop away the outer edge of the image and this will cause you to lose the highly distorted edges of the photo.
this is particularly obvious when you are dealing with a very very wide angle where normally a circular image would be seen but due to the crop you see a square image.
This review of the Canon 8-15mm fisheye contains a picture how the image will look like on a crop sensor: 
Originally by user9441. Source · Licensed CC BY-SA 4.0
user9441
12y ago
0
Generated from our catalog & community — verify before relying on it.
Yes—adapting a larger-format fisheye to Micro Four Thirds will usually reduce the visible fisheye effect, because the smaller sensor crops off the outer parts of the image where the distortion is strongest.
You still get the lens’s projection characteristics, but you only see the center portion of the image circle. That means:
- less of the extreme edge stretching/distortion is visible
- the field of view becomes narrower due to the crop
- circular fisheye images may no longer appear circular, because the sensor crops them into a smaller rectangular area
So the result still has some fisheye character, but typically less dramatic than when the same lens is used on the format it was designed to cover. The more the fisheye effect depends on the outer edges, the more obvious the loss will be on a smaller sensor.
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