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EXCERPT page containing first few paragraphs. 2022-01-23 00:35:04

Sony A7R II
Sony FE 85mm f/1.4 GM

Focus Accuracy, Dusk

Shot with Sony A7R II firmware 3.0. Sony A7R II firmware version 3.1 should be used but controlled testing showing similar problems.

It is always unwise to put new gear into production use without verifying its reliability. That is particularly true for fast lenses with autofocus.

Right away with the Sony 85mm f/1.4 GM, I noticed a disturbing tendency for Sony A7R II autofocus to be off enough to seriously degrade results at f/1.4, enough to call it a “2 stop error” in some cases, meaning at least f/2.8 would be needed to obtain the quality that ought to have been captured wide open at f/1.4. Or put another way, an error that turns a 42 megapixel camera into a ~12 megapixel camera. Or something akin to that.

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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.

  • Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
  • Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
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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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f1.4 @ 1/10 sec, ISO 100; 2016-04-13 20:07:47
Sony A7R II + Sony FE 85mm f/1.4 GM

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