I think there are a few 800mm users on here...I have been enjoying the razor sharp images this lens produces for a few months now, but I can't afford both it and the 600 which I upgraded from.
I love the 800, but my only concern is that there might be times when 800mm is too much (shooting primarily on the 1D3/1.3x crop). My supertele lineup right now is the 300 2.8IS, 600 and 800. I'm 99% sure I would sell the 600 vs the 800, but do you folks think I would have too much of a gap between focal lengths? A 500 might make sense, but it's mostly out of the picture at least for now. Although the 600 is the most flexible in this focal length, I find an astounding difference in IQ between the 800mm and 600 +1.4x, and the 800 is far nicer to handle and shoot with.
Most birds in my area are best photographed with an 800mm, but I'm sure there are situations when 600mm is perfect - tame birds or situations where you can't back up easily. What do you all think?


