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Phase One IQ4 + Schneider Kreuznach LS 40-80mm f/4-5.6 Aperture Series @ 80mm: Mosaic

This aperture series look at performance of the Schneider Kreuznach LS 40-80mm f/4-5.6 at 80mm on a planar target at far distance. Key issues include sharpness across the frame and particularly peripheral forward field curvature and focus shift.

See also this same series shot with the Schneider Kreuznach LS 80mm f/2.8. Regrettably I did not shoot things as an A/B direct comparison, but conclusions about the relative performance can nonetheless be made.

In diglloyd Medium Format:

One IQ4 + Schneider Kreuznach LS 40-80mm f/4-5.6 Aperture Series @ 80mm: Mosaic

Includes images up to full 150MP camera resolution (14204 X 10652) from f/5 through f/11 including 100 megapixel versions for perspective vs other medium format cameras, plus crops.

f8 @ 1/40 sec, ISO 64; 2019-11-29 08:54:27
Phase One IQ4 + Schneider Kreuznach LS 40-80mm f/4-5.6 @ 80mm
RAW: LACA corrected, USM {8,50,0}, SmartSharpen{120,0.7,0}

[low-res image for bot] Bottom of frame cropped off

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