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Message: <blockquote data-quote="Eyelight" data-source="post: 369204" data-attributes="member: 24753">Well, your description theorizing a stripe as well as photographing birds and balls in general led to the idea of a small ball relative to the view.  Closer ball would be bigger in the view and slower, leading to a blur we could see at some point, but not a stripe across the image.  Bear in mind, I'm just thinking along, not really agreeing or disagreeing.So, let's put some real world stuff into the calculations.  What kind of bird are we plotting against and how far away with what focal length are we going for the capture?</blockquote>