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EXCERPT page containing first few paragraphs. 2023-03-29 14:46:41

Zeiss ZM 85mm f/4 Tele-Tessar

MTF for for ZM 85/4 Tele-Tessar

Wide open MTF is already at high levels, but with a dip in the middle (which might be a mild field curvature).

Stopping down to f/5.6 should deliver peak performance, with delivering a deeper zone of sharpness of f/5.6 with less risk of degradation from minor focusing errors, which are always possible given the f/4 maximum aperture.

The astigmatism seen at f/8 approaching the edges and into the corners might be traces of color fringing behavior (lateral chromatic aberration).

Like the 85/2 Sonnar, there is a small focus shift most visible from f/4 to f/5.6 and f/8 of about 40-50 microns (at the sensor plane), but it is better controlled than the focus shift of the Leica 90mm f/2 APO-Summicron.

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MTF for Zeiss ZM 85mm f/4 Tele-Tessar

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