Sun Oct 31, 2021 4:28 pm
For jets at cruising altitude, a Dobsonian telescope with a T-adapter and a powermate/barlow (optional) is your best bet. You can attach a DSLR or mirrorless camera to that, preferably one that has focus peaking.
Alternatively, depending on how close the aircraft is, you could probably get away with using a Sigma or Tamron 150-600 and cropping, but it is more limiting compared to a telescope.
You could also get a Nikon Coolpix P900 or P1000, but it can be frustrating to use as the autofocus is slow, the zooming mechanism is awkward and the buffer depth is inadequate for shooting a lot of bursts. It's true that the Dobsonian telescope doesn't have autofocus at all, but the Crayford focusing mechanism is intuitive at least.