I have used both, but have much more experience with the 400 2.8. I must say, that lens is SUPERB! I used to shoot surfers on the beach with it mounted behind a 2x converter and a 500D or usually a 50D. It takes SICK photos even with the 2x. The 1.4x extender I only used with it a couple times, but it's of course beautiful. I've used it at a football game with no extenders on my 7D and I can't say enough good things about it. However, in the same game I used a 200 f/2 and like it more as 400 is quite far when you're on the sidelines and the f/2 is always nice


The 300 2.8 I also used for a game, and tried shooting surfers with it too. It's 2x performance is the same in my opinion as the 400 2.8 1.4x and with no converters too... I see little difference. Personally, I'd rather go LIGHT and LESS EXPENSIVE and SHORTER if you're unsure! 300 2.8 in my opinion!





- Jordan


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