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EXCERPT page containing first few paragraphs. 2023-02-08 02:50:28

Zeiss ZM 50mm f/2 Planar

MTF: ZM 50mm f/2 Planar

Wide open at f/2, contrast at f/2 for coarse structures is high, falling gracefully to the corners. Contrast on fine structures is very good at center, but becoming somewhat hazy to the edges an corners, again, gracefully.

Stopping down to f/4 raises contrast of coarse and fine structures to outstanding levels to the edges of the frame, but with a sharp dropoff to the corners (probably field curvature involved).

Astigmatism is very well controlled, and the close sagittal and tangential curves suggest a high level of control of lateral chromatic aberration — minimal color fringing.

The lower contrast in the center at f/4 relative to the mid zones is most likely a mild focus shift combined with some field curvature. The lens is actually sharper at the mid zones and edges than the center (but only in a planar sense).

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Diglloyd Guide to LEICA contains in-depth coverage of Leica M system cameras and lenses, with additional coverage of Leica M Monochrom, Leica Q.

Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.

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Variants 2, 2.8, 4, 5.6 available in full article

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