EXCERPT page containing first few paragraphs. 2019-02-23 18:19:43
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Ray angle of rangefinder lenses interacting with the relatively thick sensor cover glass of the Sony A7R introduces severe astigmatism in outer zones, along with lateral chromatic aberration.
Astigmatism can be understood as “two planes of focus generating a double image”. These are the sagittal and tangential focii, as used in MTF charts.
A specially modified Sony A7R II (KolariVision) and a stock unmodified A7R II were used to explore the performance of the Leica 28mm f/1.4 Summilux-M ASPH. This is not a lens review, and is targeted strictly at showing how the modified camera performs.
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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.
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- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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