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

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

Apertures are f/1.2, f/1.4, f/1.6, f/1.8, f/2, f/2.8, ..., f/11. Exposure started at 1/8000 second at f/1.2, and the first few (overexposed) frames were adjusted to match the later ones better.

Entire frame

Click to view the aperture series as a “movie”.

The effects are interesting for depth of field, field illumination, and distortion.

Even the shape of the foreground appears to change with stopping down (call it “aperture distortion”). This appears related to a change in the blur characteristics more than true distortion, but there is a definite feel of having the foreground stretch down as the lens is stopped down.

Note the central band of magenta; this is typical of high speed designs, along with a magenta cast to the foreground, and a green cast to the background which persists all the way to f/8— a strange effect that shows why using a gray card for white balance can be fraught with the risk of picking up the color cast.

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diglloyd Advanced Photography

diglloyd Advanced Photography includes hundreds of pages of exclusive coverage and high resolution, Retina-grade example pictures detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare. Also included is a wealth of in-context technique and workflow insight. Since 2006, diglloyd Advanced Photography is the authoritative review and on-line reference for discerning Canon and Nikon shooters. Subscriptions cost $ per year.

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Aperture series 1.2, 1.4, 1.6, 1.8, 2, 2.8, 4, 5.6, 8, 11 available in full article
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