the 150-500OS is a good lens, and it's a good bang for the buck if you need reach on the cheap...it can be had below your budget for sure if you're willing to buy used...a new copy right now is only 870...and that would come with a 4 year warranty...i think you'll have to wait quite a bit before the sellers of the 100-400L are going to realize their copies aren't going to be selling for $900+ and have to drop the price...so it'll probably stay out of your budget for a bit
personally i don't see why you'd go for the 120-400OS over the 150-500OS...prices are about the same
The 120-400 is a stop faster than the 150-500 at 400mm, it is sharper at 400mm (please see http://www.the-digital-picture.com …mp=0&FLIComp=4&APIComp=2)
, a little lighter.
. It is actually 1/3, 5.6 vs. 6.3. But I still like the sharpness of 120-400 vs. 150-500, but it is, of course, subjective.
I see your point about the 120-400 sigma haveing a 2/3 stop faster lens,,but don,t under stand how it would be sharper at 400mm,,??brighter yes ,but sharper ??
