I shoot at a fair number of airshows. For prop planes and helicopters, I generally shoot handheld at anywhere from 1/60 to 1/100 of a second to get a good prop blur. Shooting at this slow speed you will get a lot of blurred shots, but you should also get some keepers.
I used to use a D850 with a 200-500. Now I use a Z8 with the 180-600. I think that a 70-200 and a 180-600 or a 70-200 and 100-400 with a 600 prime should be useful. If you shoot with two lenses, then preferably you should have two bodies. The action can be fast, and it is much quicker to switch body/lens combos then to change lenses. I used the D850 and 200-500 for the Thunderbird shots. At the Pacific Airshow in 2023, I used the Z8, but I did not have the 180-600 yet, so I used the Z8 and FTZII with the 200-500.
If you can it’s best to try and pick up a fast-moving jet fairly far out and then track it coming in, once it is close enough so that it is larger in the frame, then fire away preferably at 20fps while panning with the jet. I would use a shutter speed of at least 1/2000/sec, but you can use 1/3200/sec or even 1/4000/sec. I usually shoot wide open at 5.6 or 6.3. I shoot at a fair number of airshows. Have fun!
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