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EXCERPT page containing first few paragraphs. 2023-02-03 05:51:54

Zeiss ZM 85mm f/2 Sonnar

MTF for for ZM 85/2 Sonnar

Wide open MTF is already at high levels centrally but dropping off gently to the edges and corners where it is on the soft side, at least in a geometric (flat) plane.

Stopping down to f/4, outstanding world-class performance is reached across the frame. The astigmatism to the edges and corners might possibly be faint color fringing (unclear).

The main weakness of the ZM 85/2 Sonnar not revealed by the MTF chart is slight veiling violet haze (blue halo effect on high contrast edges) at f/2 caused by secondary longitudinal chromatic aberration. In this regard it is very similar in behavior to the Zeiss ZF.2 100mm f/2 Makro-Planar.

Like the 85/4 Tele-Tessar, there is a small focus shift most visible from f/4 to f/5.6 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/2 Sonnar

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