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EXCERPT page containing first few paragraphs. 2023-10-01 22:31:57

Phase One IQ4

Phase One IQ4: Stitching For Broader Field of View, Higher Resolution

A bit more than two years after shooting the PhaseOne IQ4 in December of 2019, I thought to take a retrospective look at its image quality. Reviewing my images, I remain as impressed as ever that its single-frame image quality remains unbeatable.

When depth of field challenges can be met, the potential for very high resolution images with not so many frames is possible—rotational stitching. This allows a far wider viewing angle at far higher resolution.

Example — Alabama Hills View to Mt Whitney, Lazy Winter Day 

View ACR settings.

This stitch was shot with the Schneider Kreuznach LS 80mm f/2.8 with a finished field of view equivalent to a 40mm lens for the finished image. That longer 80mm focal length (vs 40mm) delivers a result that would in effect would require an 107mm-wide capture area. In other words, the 'feel' from the focal length is like shooting a 4X5 camera with its ~96 X 120mm capture are—and that is one reason to do stitching rather than a wider lens with cropping. The feel would be vastly different had I shot the same scene with a 40mm lens and cropped for this aspect ratio to ~100 megapixels—much larger foreground and much smaller mountains would have resulted. The amount of telephoto compression feels just right.

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  • In-depth lens evaluations covering behaviors not likely to be found anywhere else, based on real-world field shooting.
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  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
Variants BW,RGB available in full article
f11 @ 1/60 sec panorama stitched from 9 frames (3 X 3), ISO 50; 2019-12-11 11:55:12
Phase One IQ4 + Schneider Kreuznach LS 80mm f/2.8
ENV: Alabama Hills, altitude 4500 ft / 1372 m, 50°F / 10°C
RAW: LACA corrected, distortion corrected, push 1 stops, +40 Whites, +10 Clarity, USM {10,50,0}, diffraction mitigating sharpening

[low-res image for bot](incorrect metadata: stitched from 6 images, 2 rows of 3)

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