Summary: I have the Cosina version of this lens which is very sharp and have good contrast wide open at 400mm (even with my Nikon TC-16A tele-convertor) on my cropped sensor Nikon
Summary: I love this lens. That said, my first day out I was disappointed with the lens creep and it seems to have some vignetting though not pronounced in the final pictures.
Summary: I love this lens. That said, my first day out I was disappointed with the lens creep and it seems to have some vignetting though not pronounced in the final pictures.