I suggest grabbing a random DSLR with decent glass and trying to capture a bird in flight against the sky. Most of the time not even the species will be discernable. People with no prior experience photographing birds will have a hard time taking anything that is not blurry. It is actually not that easy even tracking something in flight through the viewfinder, especially at long focal lengths. Shaking, focus / depth of field, dynamic range, sensor noise and exposure time all work against you.

So I would be extremely suspicious of sharp clear properly exposed pictures of UFOs.