I have a nice 400 5.6 which I feel to be the best birding lens...and I have a had a few....(Canon 300, Tokina 80-400, Sigma 150-500)...
But sometimes the 400 (and even the 300 when I had that) ....was too much lens when going after hummingbirds, Toucans up-close etc. It isn't a matter of getting the 100-400 since I want a lens that does well in poor light and while that lens delivers on the zoom, it doesn't on the light.
So I have thought it would be good to get a 200mm 2.8L lens for those occasions where I am in overcast clouds, rain, under the canopy and the birds are close......I have a 7D.....
Thoughts on this? jim
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