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Phase One IQ4 + Schneider Kreuznach LS 80mm f/2.8 Example: Last Change Wash (depth of field is nil on a 53.4 X 40 mm sensor!)

I haven’t published a lot just yet from the Phase One IQ4 because when nightfall hits, there are only so many hours, and 1 AM has worn me down for a week now. Focus stacking takes 1-2 hours per image.

This 14-frame focus stack took over 6 minutes, with exposure time of 20 seconds per frame. The Phase One IQ4 made it longer than necessary by doing dark frames at random intervals for some of the images of the sequence, good for a tiny improvement in image quality, but bad when the light is failing.

In diglloyd Medium Format:

Schneider Kreuznach LS 80mm f/2.8 Examples: Death Valley / Eureka Dunes Area

Includes images up to full 151MP camera resolution.

Lest there be any doubt as to the mandatory use of focus stacking for a huge 53.4 X 40.0mm sensor at f9 (f/11 would add only marginally more DoF), compare the single frame to the focus stacked image on the page above. It is impossible to make an image like this without focus stacking, the exception being the exceptionally rare scene amenable to a tilt lens, of which there is only one in the Phase One lineup which means it is impractical in general and still inadequate in most all cases.

f11 @ 20.0 sec electronic shutter focus stack 14 frames, ISO 50; 2019-12-09 17:00:23
Phase One IQ4 + Schneider Kreuznach LS 80mm f/2.8 + polarizer Zeiss
ENV: canyon SE of Eureka Dunes, altitude 4100 ft / 1250 m, 55°F / 12°C
RAW: LACA corrected, push 1.6 stops, USM {8,50,0}, SmartSharpen{60,0.8,0}, diffraction mitigating sharpening

[low-res image for bot]
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