What in the world?????? :confused: $100? Sigma 500mm telephoto lens
S STM Senior Member Jul 9, 2014 #3 Mirror lenses are out of style, though they should not be, but for that cheap, there may be issues like secondary mirror separation. I would definitely look VERY closely at that one.
Mirror lenses are out of style, though they should not be, but for that cheap, there may be issues like secondary mirror separation. I would definitely look VERY closely at that one.
