Croasdail wrote in post #18719343
On Canon pro grade lenses I have never heard of anyone having issues with IS taking time to spin up. Particularly with with sports where you are always or should be always acquiring focus or subject selection. IS would not go to sleep in the normal usage during a sporting event. Maybe doing nature stuff.... sure..... where shots are literally minutes apart if even that close. But I am almost always acquiring subject during a game... and the IS never spins down and goes to sleep.
Now maybe with cheaper consumer grade lenses that may be the case.... don't own any so couldn't tell you. But a 1D and attached pro lens should never not be ready to take a shot. I've never seen it. I've messed up shots for other reason. I've had the limiter engaged when I shouldn't... etc. Wrong focus mode. But IS holding me up... guess I'm super lucky.
I could be under the basket, and a player launches into the air unexpectedly. I can raise the camera, hit the BBF, and rattle off a shot. At the time I hit AF, the IS kicks in, but I am also taking a shot. It can and does happen. It doesn't happen all the time, because I might hit the focus button as I am raising the camera and that gives the IS just enough time.
I still haven't seen anyone really post any real important reason to leave IS on during sports shooting. I prefer to leave it off, saving mechanics and battery life, since it does nothing for the results, and never have to worry about any IS impacts on any of my shots for the evening. If there is some sort of advantage (other than habitually leaving it on just because one feels better about having it on), I would like to know. I can try to change over here in a month when the season starts again, I am willing to try new tricks and techniques to improve my results. What sports do you shoot, and what advantage is there to you having IS switched on and shooting sports for several hours?
EDIT: Your point about IS systems certainly is a worthy one to consider. Even Canon lenses, through the years, have different behavior with their IS systems. I started turning IS off back with the MKI of the 70-200 and other lenses, Canon and 3rd party, years back. However I took out my 700-200 II and I see not really noticeable twitch on that lens. So it could very well be that both Canon and 3rd party lenses over the recent years have better IS systems where the IS doesn't really even twitch when it activates, where older lenses did. Even the old 100-400 had a noticeable twitch in the viewfinder when I had one. So this could be the thing that explains why we have disparate views. Still, I see no advantage to leaving it on, for what I shoot, at 1/1250 to 1/2000, unless there was something that was posted I was not aware of.