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Adapted Lenses, Ray Angle Degradation
Testing shows that the promise of adapting lenses is far more appealing than the reality. Lenses designed for Canon and Nikon do not interact well, which appears to be due to ray angle difficulties caused by the thickness of the sensor cover glass.
The ray angle problem seen with Leica M rangefinder lenses on Sony mirrorless applies anytime time there is a mismatch between the optical design and the actual camera on which the lens is mounted, namely any additional optical effects outside the lens itself.
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