Hi there,


Well, the 200mm f/2.8 L is compatible with the 1.4x extender (according to Bryan's review), which would give you an almost 300m f/4. So, why don't you also consider the 400m 5.6 L? Yes, it doesn't have IS which can be a deal breaker... But if you're going to be shooting a lot at 400m, the prime should provide better IQ than the 100-400 or the 300 f4 + extender.


Tony