I do use the 300 f2.8VR for airshows and aviation. I used to think 400mm was ideal for airshows but I then limited myself to 300. At 300 most subjects are still accessible but at a different point in the display. Sometimes I have to be patient and wait for the moment, other times leave something smaller altogether. A wide range zoom yields photo's all along a display whereas a 300mm prime offers to spots, one to the left and one to the right - that it!
The lens is very sharp and fast to focus and although large its fairly inconspicuous.
I went through the 400 or 500 phase but settled at 300, personal preference I guess.
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