I don't see a point of getting another mid-range zoom when you've already got a good one in the EF-S 17-55 f/2.8 IS.


99% of the time I always recommend people to invest in glass instead of body, but for your case, if you want versatility, just get another body and mount the 70-200 f/2.8L IS on. I'm sure you won't miss the 56-69 focal length.


1. If you want to stop action, IS is useless, IS helps minimize camera shake.


2. No, you would not be better off withthe 24-105,you've already have the reach the f/2.8and IS in the 70-200 f/2.8L IS


3. You don't need IS, but it's always welcome


4. No, 24-70 is equivalent to 38-112 on your 50D, you'd loose the wide angle