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Forum: Pentax K-1 & K-1 II 12-07-2018, 07:25 PM

HD Pentax-D FA* 50/1.4 comparison with Zeiss Milvus 50/1.4 and Sigma 50/1.4 Art
Posted By Class A

Replies: 64
Views: 8,692

The 69.4 lp/mm figure is inflated due to sharpening. One can clearly see the overshoot in the edge profile charts.

Lens resolution measurements are extremely sensitive to sharpening and clearly ACR performs some sharpening (presumably even when sharpening is set to zero).

I don't want to take away anything from the D FA* 50/1.4 -- I'll get a copy myself as soon as a good opportunity arises -- but the measured lp/mm figure is not trustworthy.

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