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Aperture Series with Canon 85mm f/1.2L II (Roof)

This series is intended to explore sharpness and field curvature (if any) with the 85mm f/1.2L II.


Apertures are f/1.2, f/1.4, f/1.6, f/1.8, f/2, f/2.2, f/2.5, f/2.8, ..., f/11. Exposure started at 1/8000 second at f/1.2 through f/2 (adjusted in processing). After that, exposures were increased (compensated) in post processing, because the non-linear exposure seen in the mosaic comparison occurs here also.

Entire frame

This series shows the field illumination characteristics, which even with some adjustment, are uneven. Whether this is the lens or camera is unclear. At around f/2.8, 1/3 stop is lost; the image becomes darker. As shown here, the f/2.8 and smaller apertures were given +1/3 compensation, and even so they are still darker than f/2.

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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

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AB comparison image
Aperture series 1.2, 1.4, 1.6, 2, 2.2, 2.5, 2.8, 4, 5.6, 8, 11 available in full article

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