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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 Sigma 35/1.2 here has pronounced field curvature (see shootout vs Zeiss Loxia 35/2). Some weeks after writing this and following discussion with other knowledgeable people, I have concluded that this is NOT a bad sample, but actually a quite good sample, with typical behavior for the design. In particular, the lens used here shows very good symmetry which is highly unlikely if anything is off kilter.
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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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