EXCERPT page containing first few paragraphs. 2019-09-23 00:58:01
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Note: the Zeiss data sheet for the Batis 18mm f/2.8 on the Zeiss Batis 18mm f/2.8 web page shows the software-corrected distortion graph. An easily-missed footnote that reads 'camera correction “on”'; it is not called out in any way—easily missed. It ought to be part of the graph itself, in red or some such.
Sony mirrorless cameras apply distortion correction to JPEG only, so unless distortion correction is performed during RAW conversion, the results are as shown below in the Uncorrected graph. Distortion correction has implications for sharpness and micro contrast and thus true optical distortion without correction is an essential part of the data sheet.
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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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