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In-depth example: stopping down at night

This example looks into how much to stop down for crisp images, especially at night.

While central sharpness is very high wide open, it drops off rapidly, apparently due to uncorrected aberrations such as sagittal coma flare, but primarily field curvature.

Images from the 21 megapixel Canon EOS 5D Mark II.

Stopping down

We’ll use the WWDC example for the crops shown here.

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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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