I agree 100% with Stephen, on looking at my last years images from airshows, I found most of them where in the 250-400mm range, but then most are cropped to approx 2/3rd original size
The attached photo was taken with the Bigma (Sigma 50-500mm) which in my opinion is an excellent lens, especially for shooting aircraft.
Sally B was taken at Waddington with a focal length of 313mm using the Bigma, then cropped to 2/3rd original size.
Harry
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