Originally Posted by glarizza
If the only difference was the IS (i.e. you're not worried about any difference in optical performance), then you just have to decide how often you would use 300mm f/2.8 at a wedding. And if it could not be replaced by 300mm f/4 IS (or 70-200 f/2.8 + 1.4X TC). Personally, I would buy a 1.4X TC for my 70-200 f/2.8 IS, and pocket the $1700.
Another thing to keep in mind is that our standard for sharpness will probably go up in the future. So a shutter speed that was handholdable with IS in 2009 (say, 300mm at 1/60 with IS) will require faster shutter speeds in 2011. Or maybe not -- maybe our standards will stay about the same (they're already high enough for 8x10 and sometimes 12x18 prints).
Another factor to consider is that IS can sometimes *blur* an image at 1/500 and above (Thom Hogan explained this to me) . For sports I think you'll be good enough with a monopod and no IS.
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