EXCERPT page containing first few paragraphs. 2019-02-22 11:43:19
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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.
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.
Diffraction drops contrast overall and for fine detail at f/8 (in effect what one hopes to see, indicating an excellent performer). By f/11 its effects are quite dulling. At f/16, the performance shows lower contrast than at f/1.8 (but with much more depth of field)—see Mitigating Micro Contrast Losses from Diffraction Blur in MSI. These behaviors are all expected and good in this sense: a lens that shows little effect from diffraction is not very good to begin with! In other words, the better the lens, the more diffraction throws a wet blanket onto performance.
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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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