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EXCERPT page containing first few paragraphs. 2022-01-22 18:35:02

Sony A7R IV
Sony FE 50mm f/1.2 GM

Lens Skew

The Sony FE 50mm f/1.2 GM is a high performance optical design. My guess is that it is difficult to manufacture without significant sample variation, since the high performance makes high precision assembly essential. So I understand that there is going to be some variation. But when quality control allows obviously troubled lenses to leave the factory it means loose standards—too loose.

But note well: a dozen years of doing what I do tells me that sample variation issues exists with just about every manufacturer. It is NOT specific to Sony.

The first two samples* I tried showed slight asymmetry but well within what I would consider typical, and really quite good for an f/1.2 lens. And well within the lens mount / sensor parallelism tolerances. See Sunrise Over Patriarch Grove.

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f2 @ 1/2500 sec, ISO 100; 2021-07-08 15:33:49
Sony A1 + Sony FE 50mm f/1.2 GM RAW: LACA corrected, vignetting corrected

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