>Quote >Having the VR run when focusing means the VF is steady now. >Although the VR start up time is so fast that the shutter >release action is enough time for it to stabilize the instant >before the shutter opens, purpose of the VR activation during >AF-On is for VF and AF and metering sensors are stabilized >also. So the new method is an improvement in all but battery >life. >Stan<<<
This is certainly true of modern VR lens, but there is often a noticeable lag with the old 80-400 while the lens stabilizes. I am not saying you cannot use VR to shoot sports with that lens. I prefocus on the spot where I will take the shot first by pressing the AF-ON button then press it again and hold it on the subject as they approach.
One of the first things I do when I get a new camera is to set the AF-ON (or AE-L/AF-L) as the only focus.