EXCERPT page containing first few paragraphs. 2020-09-22 13:19:45
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MTF wide open shows modest contrast even in the center and across the field, but stopping down to f/5.6 shows very high performance approching the very best lenses.
The big jump in contrast at center from f/2 to f/4 suggests that focus shift has been minimized, though the dip at the 15mm offset undermines that idea and suggests a differential focus shift, minimized at the center.
On high resolution digital, f/2 looks to be best suited for pictorial effect, just as with the ZM 50/2 Biogon. Stop down one stop for a big boost in contrast, with f/4 near optimal and f/5.6 definitely optimal.
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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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