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Field Shot f/2.8 vs f/4

This example shows the f/2.8 performance problem in the field. See also the Mosaic comparison.

The frame used here is the one used on the Hot Spot page. I shot this scene 4 times, with Live View focus and autofocus. Same results.

Show below is a crop. Click for an actual-pixels crop, mouse over to see the difference. (The f/4 frame is darker at center because of the hot spot problem at f/2.8).

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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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AB comparison image
Variants f/2.8,f/4 available in full article
f/2.8 <===> f/4

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