Tripod
This was shot from a Tripod using LiveView, 2sec self timer.
800mm F16, only ok center sharpness still lots of CA... Terrible corner softness which I'm not used to seeing on any telephoto... No real vignetting though.
Other than being horribly dark in the viewfinder, manual focus, pretty much a tripod only lens, and soft corners I guess it's OK for $99 if you are OK with all the negatives.