Imaging recource: A new test debuts at IR: The Sony A9’s rolling shutter really *is* pretty dang fast!

If you've ever shot a video that included a fast-moving subject like an aircraft's propellers, you'll have noticed that they seem to be being whipped through the air and then bizarrely discarded. If so, you've been a victim of the rolling shutter effect. (Or more colloquially, the "jello effect.") This unusual photographic oddity is best-known these days for its adverse effect when shooting videos, but it's equally an issue in still photography, too. But what causes it, and how can we measure and quantify its potential...
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