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| p.1 #6 · p.1 #6 · Upgrade from 200 2.8 and 100-400 to a 300 2.8? |
I love my Canon 300 f2.8 L IS, and generally recomend it for a lot of situations, but in your case I think most of your problems with the new 100-400 are related to the 5D2 body, which is not an ideal camera for fast motorsports. Do you have a way to borrow or rent a 5D3 and check out the 100-400 with that for the same action? An upgrade of your body from the 5D2 to a 5D3 will cost you some, but the auto focus performance is a very big step up, plus you get some frame rate too. You also get a little bit better performance in the 5D3 at higher ISO, so the 100-400 is a little more tolerable.
If you need zoom, the 100-400 L IS or the 70-300 L IS or any of the 70-200 L IS lenses are all ways to have it and still get reasonable image quality. If you do not need zoom, then a 300 f2.8 L IS or a 300 f4.0 L IS are very nice lenses, both with great image quality, and they each take 1.4 tele extenders well. Do not discount the 300 f4, which you could combine with your current 200 f2.8 and have a pair of nice primes. But with most of your shots out of focus, I think you should try a 5D3 first over a new lens, and then go from there.
You did not mention about if you will be hand holding or can consider using monopod or a gimbal head, but the 300 f2.8 lens is a serious step up in weight and bulk over any other lens you have mentioned, and depending on your strength can be very difficult to hand hold for a long event, or even a short one. That is part of the beauty of the smaller lenses like a 300 f4, or the 100-400.