EXCERPT page containing first few paragraphs. 2020-11-25 15:07:06
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Assessment of the SpeedBooster + Canon 85mm f/1.8 using manual focus at maximum magnification for accuracy.
Two frames are considered: wide open at f/1.3 and stopped down to f/5.6. Aperture f/5.6 is four and one thirds stops down and represents the peak performance that can be expected (setting aside depth of field). Use of f/8 might make further improvements in some areas via more depth of field.
Native optical performance is shown; correction of any lateral chromatic aberration is advised, but has not been done here in order to show the true optical performance as shot.
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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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