04-17-2015, 04:36 PM
With the lens being available for the narrow F-mount, I bet the amount of light lost will be high, and the mechanical vignetting too. The lens does not seem to render very nicely (muddy bokeh):
http://photorumors.com/2015/04/15/is-thi...rame-lens/
http://photorumors.com/2015/04/15/is-thi...rame-lens/