EXCERPT page containing first few paragraphs. 2019-02-15 12:13:17
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This aperture series was taken to evaluate sharpness for a planar subject to evaluate field curvature, and also to evaluate distortion and vignetting.
The lighting was the gray light of winter dusk (moderately blue), and the Olympus E-M5 generally does not provide pleasing results under such conditions. But the results are instructive, even if the subject is boring.
The windows being covered by screens, a prominent moiré pattern quickly develops, showing the suggesting the Olympus E-M5 has a weak anti-aliasing filter, though screens in general can cause moiré no matter what, so this is not a proof.
Focus was right in the middle using autofocus, which is quite accurate under such conditions (and manual focus is a challenge with the 17/1.8, due to a high level of aberrations wide open which cause a low contrast image to be hard to focus).
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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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