Didereaux wrote:
Laura, at 600mm you're aperture opening on that lens is 6.3. It is 5 at 150mm. Also re effective focal length fro that lens on a 7D (crop frame) is ~900mm. So you should get away with dropping your shutter speed as low as 1/100th. That will still get the birds with some wing movement,but you will be able to drop your ISO to ~600 and reduce the noise level somewhat.
:thumbup:
Thanks for this...yes, I was playing around with high ISOs after reading some posts on here and I realize I over did it. They are quite noisy!