Definitly leave the IS alone. Though it helps in low light and at long zooms lengths. unless it's a "L" series, the picture quality isn't gonna be as good. I worked in a camera store and had the oppurtunity to shoot with both "L" and non "L" seris IS lenses and though it helped, The non "L" lenes just weren't clear enough. Also, the non "L" IS lenes aren't fixed focal lengths and could be a pain in the @$$ in a studio setting. If you can afford it, go with the 24-70 2.8L, I shot with it, sold one to a friend and it kicks butt [img]/ubbthreads/images/graemlins/wink.gif[/img] If you want to save some dough like me [img]/ubbthreads/images/graemlins/tongue.gif[/img] , look into the Tamron 28-75 2.8 XR Di series. It shoots 99.5% as good as the Canon, weighs less than half and costs a third less. I've shot almost everything on my website with it, check it out. As for the zoom, I went with Canons 70-200 f4L. An awesome lens, very clear and not to heavy, although I lose a stop to the 2.8, I also saved over $600 and I just couldn't justify the difference. It may not be necessary in a studio, but you'll be glad you have it when on location and Mother Nature inhibits you from getting close enough. Good luck in your search.
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