Try and go to a shop and try them. I think you will go for the 70-200mm 4L when you can have a go with it. Also remember that the more light that comes in the faster the focusing. The ideal one would be the 70-200mm 2.8 or the 70-200mm 2.8 IS, if you had the cash, these let intwice the light in over the 4L and with xxD cameras which have a more sensitive focus point for f2.8 and lower means better focusing. The 70-200mm 2.8 is not much more than the70-300mm IS DO. I know someone who had the DO and is trading it in for the 7-200mm 2.8 IS now.


The 70-200mm 4L is amazing for the cost, thezoom ring is so smooth on it and when I used it for horse events it was so easy to zoom in and out, far better than the 24-105mm IS 4L which is the other lens I have. I now have upgraded my 4Lto the 2.8 IS which will now last for a long time. The thing is with the 2.8 IS, is that the IS is like the 100-400mm L, it has 2 options, one is nomal and the other is forpanning.