Softness on the edge

Started Feb 22, 2021 | Questions thread
MitchAlsup Veteran Member • Posts: 5,462
Re: Softness on the edge

Kendunn wrote:

Getting a weird, overly soft edge on rare occasions, not sure whats up. Canon 5DS with a 17-40. The example posted shows the top 20% of the frame is way too soft, but the rest of the frame is reasonably sharp, including the bottom. It was shot at 35mm, f/7.1 off of a tripod, I think it was 1/20 at ISO 100. Most of the time images are fine. Loose element?

You do realize the stuff at the top is more than twice as far away as where the tree emerges from the ground !! do you not ?

My guess is that the lens accommodation (near-focus to far-focus) is the culprit. Your choices are to push the aperture slower and get diffraction across the whole image or to widen the aperture and deliberately take the top OoF.

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