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What happens when you attach a fisheye lens in reverse with a reversing ring?

Optics can be viewed from either end. I.e. the subject can become the sensor, and the sensor can become the subject; the functional light paths/ray traces remain the same. What a camera lens does is ...
Steven Kersting's user avatar
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What happens when you attach a fisheye lens in reverse with a reversing ring?

Generally you can't. Most fisheyes have convex/bulgy front elements and no filter threads. E.g., the Samyang/Rokinon 8mm f/3.5: It can't take any screw-on filters. Which means there's no way to screw ...
inkista's user avatar
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