EXCERPT page containing first few paragraphs. 2019-07-26 13:30:43
The design condition for the ZM 35mm f/1.4 Distagon is for 0.8mm thick sensor cover glass; see the MTF page for performance discussion for the as-designed platform of Leica M digital.
Mounting the 35/1.4 on a mirrorless Sony A7x camera (using an adapter) causes ray angle issues that severely degrade MTF because the sensor cover glass at 2.5mm thick refracts rays increasingly strongly away from center. Not until f/8 is reached does performance approach as-designed performance, and it is still impaired. See MTF charts below. On Micro Four Thirds, the sensor cover glass is typically 6mm thick, and the effects are extreme.
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