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Message: <blockquote data-quote="Eyelight" data-source="post: 420623" data-attributes="member: 24753">When panning it is the difference between pan speed and subject speed that is required to freeze the motion.  If the pan speed perfectly matches the subject speed, then a fairly slow shutter can be used; even slower than required for a handheld shot at a static subject.It's the roughness of the panning that needs to be overcome, similar to shake for a static subject.  I'd say 2 times the focal length for a smooth well matched panning motion and faster anytime the panning cannot be smooth and well matched. Looking at your good shots will tell you quite a bit, both with the right speeds and confirming the ideas about whats going on.</blockquote>