EXCERPT page containing first few paragraphs. 2019-09-18 12:02:55
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Sigma provides an MTF chart for the lens wide open at 10 and 30 line pairs / mm, and only at f/2.8. The performance at f/2.8 is astonishing, though the spectral weighting is not detailed, and the 10,30 lp/mm is not directly comparable to the 10/20/40 lp/mm provided by Zeiss or the 5/10/20/40 lp/mm provided by Leica.
Still, the performance at f/2.8 looks stunningly good. If the DP Merrill line is any guide, stopping down to f/4 should provide near perfect image quality corner to corner, bringing up the edge to corner performance to put the icing on the cake of an already outstanding performance.
As shown, the MTF looks to be world class.
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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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