Bench testing is done. First outing with a "new to me" lens.
33°32'30.13"N, 111°37'13.36"W --Bob
Outstanding image Bob. Asking because I don't know any better (and this has happened to me) -- the sky in the top of the image appears darker than the rest of the sky. What causes that? Is it intentional? As I stated, it has happened to me but I can't recall the circumstances.