04-14-2011, 12:26 PM
15-85 and 70-200f4; the 28-135 is really a poor choice of a lens; the 17-55 is interesting but with the 50f1.4 you can probably get away with the 15-85 which is rather snappy (good contrast). The 70-200f2.8 is just plain heavy. The 100-400 is an interesting choice if you need the length which you might for birds; but it is also a bit slow. If bird in flight is your primary focus than maybe 400f5.6 or 100-400.