aguia
Active member
Assuming you have a professional quality tripod, and rails to support the lens, and a follow focus, then I agree. Anything less than a pro setup and you can end up with jitter on the lens, and jello in the shot, especially on windy days. The follow focus would be a must, as putting your hand on the lens will cause micro jitter as well.
That micro jitter disappears with the IS, so it might be cheaper in the long run if you're semi-pro and don't have all that gak & shrap.
Also, if you ever plan to take photos with it, don't think twice, get the IS.
I do lots and lots of shooting with long lenses and even with the most "Pro" set-up it is a percentage game. I've haven't noticed any appreciable improvement in the percentages with IS on a tripod and if I'm doing a move I generally need to turn IS off. I think IS is effective in a relatively limited set of conditions, hand held and probably 200mm and under. Over 300mm on an APSC or 4/3rds camera wind is usually the biggest culprit, tripod mass becomes a factor. If you can live with the 1 stop light loss the f4 version is indeed cost-effective.