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Message: <blockquote data-quote="J-see" data-source="post: 429523" data-attributes="member: 31330">During this period of the year the Tam has a harder time grabbing and holding focus. f/6.3 at the long end isn't helping either. I always notice that during burst which presents itself as a reasonable fail-rate. But the moment I forget to switch VR off, the number increases quite a lot. I tested it and each time I forget it, it's immediately obvious VR does do no good there.I don't know if that is the result of too many things happening at once, VR trying to correct for shake while the lens has to correct for subject movement and the one compromising the movement of the other or maybe the one simply causes a delay which slows tracking down and as a result, I shoot more out of focus shots. At some birding site I read VR slows down AF when using AF-C but there's no explanation to it.At 600mm it doesn't need much to not be in focus.That's why as a general rule, I don't use VR when shooting above 1/400s. At lower speeds, my subject is normally static.To add: I use BBF but the moment I press focus, VR jumps into action since I see the viewfinder stabilize. If Tam follows the same logic as Nikon, lens correction starts the moment I release. I read on other cams it doesn't activate VR but that's clearly not the case for me. At least not in regards to the first algorithm.</blockquote>