Softness on the edge

Started 11 months ago | Questions thread
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Kendunn Contributing Member • Posts: 880
Softness on the edge

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?

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Canon EOS 5DS
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