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<blockquote data-quote="WayneF" data-source="post: 368057" data-attributes="member: 12496">How real is this question?&nbsp;&nbsp; A 35mm DX lens at 20 feet has a field of view of 13.75 feet.&nbsp; If tennis ball covers the frame width in 1/250 second, it would be going 2343 MPH.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp; &nbsp; I think its hard enough to deal with real problems instead of going looking for them.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />At a flash sync speed of 1/250 second, the shutter is fully open, not a slit.VR yes, works while the shutter is open,&nbsp; but it does not change focus.AF-C, out of consideration while the shutter is open.VR does not affect subject motion, only camera motion.</blockquote>

[QUOTE="WayneF, post: 368057, member: 12496"] How real is this question? A 35mm DX lens at 20 feet has a field of view of 13.75 feet. If tennis ball covers the frame width in 1/250 second, it would be going 2343 MPH. :) I think its hard enough to deal with real problems instead of going looking for them. :) At a flash sync speed of 1/250 second, the shutter is fully open, not a slit. VR yes, works while the shutter is open, but it does not change focus. AF-C, out of consideration while the shutter is open. VR does not affect subject motion, only camera motion. [/QUOTE]

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