EXCERPT page containing first few paragraphs. 2019-05-22 01:09:18
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The MTF chart shows excellent micro contrast wide open at f/1.8 with highly uniform sharpness corner to corner at all apertures. Overall contrast is superb wide open, even into the corners.
Since the MTF chart represents raw optical performance but the 3% pincushion distortion is flagged as required and that degrades micro contrast, the MTF chart is somewhat misleading as peak performance can never be as good as claimed when distortion is corrected.
Peak performance is reached at center by f/2.8, but the variation (wave inflection) across the field looks to be a mild field curvature; stopping down a bit more delivers outstanding micro contrast at f/5.6, far exceeding most lenses. As perspective, this performance is no less good than the very best Leica M lenses and better than nearly all of them. Minor astigmatism is present.
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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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