EXCERPT page containing first few paragraphs. 2019-05-20 12:49:12
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Some pincushion distortion is typical for medium telephoto lenses, but this level of distortion when uncorrected will be very noticeable. By comparison, the Zeiss 85mm f/1.4 APO-Planar has distortion so close to zero it can be called distortion-free, and the Zeiss 85mm f/1.4 Planar has about 0.2% distortion—about 15X less than the Batis 85/1.8. All lens designs are compromises, so it seems that distortion was traded off for uniformly high sharpness and a smaller/lighter design, knowing that the camera can correct for it automatically (or the raw converter).
To my eye, pincushion distortion is visually troublesome compared to barrel distortion, and this 3% pincushion distortion is unacceptable for many purposes if not corrected: skylines, buildings, etc would bow upwards, and filling the frame with a face is not going to look flattering—so plan on enabling distortion correction for the 85/1.8 Sonnar. Problem is, correcting the pincushion distortion degrades sharpness and micro contrast, as the example demonstrates.
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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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