100-400 and 400 2.8 IS for Motorsport

WindowLicker wrote:

Just managed to get a 400 2.8 IS for a bargain, and already have a 100-400L. I wasn't initially impressed with the image quality and focus accuracy of the zoom but on my second outing I got these shots:

Goodwood

I really valued the ability to use the full zoom range and as I prefer long panning shots, the slow aperture doesn't bother me at all. But I did want to have the option to take the thin dof super tele shots and the 100-400 is too slow to really isolate a subject, hence my 400 2.8 IS purchase. my initial thought was to sell the 100 400 to help fund the 400, but I'm now thinking of swapping for a 135 f2, which would work with my 2x III extender would help me fill in the gaps.

the 100-400 and 400 would just be too much to lug around at a race.

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