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Canon 100mm f/2.8L: Vignetting

Vignetting, or the darkening of the frame at wider apertures involves both corners as well as overall brightness. Wide open at f/2.8, the overall brightness is about 2/3 stop darker than one might assume, with some moderate darkening of the corners over and above the overall effect.

Aperture series

Stopping down to f/4 eliminates the issue as a practical matter, though there remains some modest corner darkening. Stopping down to f/5.6 evens things out to near-perfect (and f/5.6 is also the aperture at which peak optical performance is reached, assuming an optically correct sample).

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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.

Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.

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  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
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f/2.8 @ 1/160

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