Dman,
I admire your knowledge of birds. I am just coming into the game, this last couple of years. I set my goal to collect identifiable pictures of 100 different bird species, and am up to 66. Just got an L-glass lens (100-400) that takes away any excuse I might have for grainy or blurry pictures.
Care to offer (anyone?) some tips for good bird photography? I am stewing now, over the tradeoffs between ISO an aperture. Always use largest aperture and lowest practical ISO?
Can you get really crisp images with ISOs as high as 400 to 1600 (Canon)?
With image stabilization, do you still hold out for shutterspeeds faster than the inverse of the focal length? I should think not, but do you TRUST it for two stops?
Ivar