I agree, I can rarely get close enough.AlanF said:Where I live you can rarely get close enough to birds. 600 is not long enough for me. But, on my one birding holiday in Brazil, the 100-400 on a 7D was pretty optimal as we got so close to the birds and a 600 would have been too long and unwieldy for much of the time.
The issue becomes complicated with very long focal lengths, distortion from the air, haze, vibration, and the like seem to make 1200mm as much as I can handle. I tried my 600mm with 2 TC's stacked so it was at 1680mm and ended up with really poor quality images. This was partly due to vibration, distortion from the two TC's, and haze or air currents. Even then, eagles that I thought were close were still too small in the image, and cropping severely made it worse yet.
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