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Sony A7R
Zeiss Batis 25mm f/2 Distagon

A7R II Kolarivision Mod: Zeiss Batis 25mm f/2 vs Unmodified Camera

A specially modified Sony A7R II (KolariVision) and a stock unmodified A7R II were used to explore the performance of the Zeiss Batis 25mm f/2 Distagon.

In particular, a key question is whether modifying the Sony A7R II to deliver better performance with Leica M lenses also modifies (degrades) the performance of native lenses which expect the appropriate thickness and refractive-index sensor cover glass.

The answer speaks directly to whether a modified Sony A7R II is suitable as an all-arounder, or whether shooters might need both an unmodified camera (for native lenses and/or DSLR lenses) and a modified camera (for Leica M and Zeiss ZM rangefinder lenses).

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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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  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

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Color balance with unmodified Sony A7R II, and with Kolarivision modification

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