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D800E and image darkening at lower f stops

venusian

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"D800E and image darkening at lower f stops"

venusian Registered since 17th Dec 2008
Sun 21-Apr-13 01:15 PM

I took pictures of a still object with camera on tripod, shutter release cord, mirror lock up, etc. using a Zeiss 50mm Makro Planar ZF.2 and a Nikon 85mm f1.8 G lens.

For the Zeiss lens, the only variable that changed was the f stops: they were f/11, f/8, f/5.6, f/4, f2.8, and f/2.

I notice that from f/11 to f/4 the brightness of the images was about the same and that the histograms shifted slightly, but not materially. However, images taken at f/2.8 and 2.0 were darker than the preceding f stops and their corresponding histograms shifted to the left, with f/2 being a somewhat darker image than f/2.8.

When I repeated this using a Nikon 85mm f/1.8G lens, the image darkened and the noticeable left-shift of the histogram occurred from f2.8 to f/1.8.

Can anyone suggest reasons why images get darker at the lower/lowest f stops compared to higher f stops?

If need be, I can provide samples.

Thank you.

Nick (Roxbury, Connecticut Nikonian)

A general, generic topic D800E and image darkening at lower f stops [View all] , venusian , Sun 21-Apr-13 11:15 AM
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