Nikon Z 800mm. Right now shooting with the 180-600 zoom with a converter at 1200mm. the 800 will give me 1600mm with the converter. (I think we may have hijacked this OP, sorry, will start new soon)
I have shot with the 1000mm catadioptric mirror F mount with converter at 2000mm but that is manual focus and basically useless for my purpose, on top of the fact it only has a 1 deg angle of view, which means difficulty finding your subject! 1600mm will be 1.5 deg, and 1200mm is 2 deg.
I have also shot with the P-1000 at 3000mm but it is impossible to find your target with an angle of view of .5 deg and one must zoom out, find the target and then power zoom in on it. it's a little slow on focus and shoot too.
shot with the Nikkor 1000mm cat w/converter at 2000mm, probably 3000 ft altitude and 1 mile away:
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