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EXCERPT page containing first few paragraphs. 2019-11-18 11:03:13

42MP Sony A7R III
60MP Sony A7R IV

Shootout of Sony A7R IV vs Sony A7R III: View Past Greenstone Lake to North Peak

This field comparison between the Sony A7R IV and Sony A7R III uses the Sigma 35mm f/1.2 DG DN Art, which when focused optimally, is one of the sharpest lenses available for Sony.

However, the sub-optimal sample used here has pronounced field curvature (see shootout vs Zeiss Loxia 35/2), perhaps due to bad element spacing of its large aspheric element. Stopped down it is beautifully sharp, but not in anything like a geometric plane—more like a curved bowl, with the center of the bowl at distance and the edges curving closer. That said, a highly credible user tells me that samples of the Sigma 35/1.2 exist that have minimal field curvature.

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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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  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

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Sony A7R IV

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