100-400 in spring?

Martin.au wrote:

FingerPainter wrote:

Do you get a lot of 5-6" tall birds who happily stay within 15' of you where you live? Caged birds don't count. Around hare, it is more like 50'. The DoF then will be a more than adequate 8 inches. I'd much rather have f/4.

Maybe nzmacro can correct me if I'm wrong, but it seems to me that to get proper brightness of the underside of a flying bird, one would need to shoot at about ISO 2000 if one was at 1/1000 and f/6.3.

I take it you don't shoot birds much.

Not a lot, no. Especially not small ones.

Do you have something useful to say Martin?