Upload & Sell: Off
I'm having a bit of fun right now, comparing a D4 with a 1D X. I've been a Canon user in the past, Nikon user for a while, D4 user now but I just got a 1D X and I'm thinking about switching. There's no compelling reason so far but I've only been using the 1D X for a day.
Anyway, I was curious about one thing: using the 70-300mm f/4-5.6L for sports. I've always used the 70-200mm f/2.8 USM IS (or its Nikon equivalent) and I assumed I'd get another one for this test.
However, I'm wondering if the 70-300mm f/4-5.6L might be a better overall choice. If I look at all the photos I've taken with the 70-200mm, most of them have been at f/4 or slower and most of the photos I did take at f/2.8 would just as easily have been taken at a slower aperture. (Auto ISO has really made life easier!)
One of the lenses that's only available from Canon is the 400mm f/5.6 but perhaps with the 100mm extra length of the 70-300mm, I wouldn't want it.
If anyone has used the 70-300mm f/4-5.6L for sports photography, I'd be interested to hear your opinion of it, particularly if you've also used the 70-200mm f/2.8. I'm photographing horse riding and soccer, so the light is usually very good. I'm mostly interested in focusing speed, as I hear that the 70-300mm f/4-5.6L has excellent image quality, comparable to the 70-200mm f/2.8.