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Originally Posted by Words  For birding, the 400 5.6 prime is my choice (I have the 100-400 and the 400 f/5.6). Both lenses are good, but the prime is better for birds and gets me shots the zoom just won't. Yes you lose the ability sometimes to have a wider view but it's really comfortable hand held, and with a monopod you can work in poor light (it's much better wide open than the 100-400). It's also faster for AF. |
Couldn't have summed up this lens any better myself.
The only thing I would add is it is one of if not the best lens for in flight shots. It's light enough to hand hold for long periods and the AF is superb.
I'm very satisfied with mine.