Hi . Thanks for replying . I've been doing a lot reading and you-tubing . I decided against the earlier listing as there were no returns (e-bay seller) . And in my quest have gained interest in a Nikon D610 . I have come to understand the crop factor a little , but if I'm to get a full fame , why not find a decent value (to me ) full frame lens ? The search continuesIt shouldn't be ... the Nikon FX bodies will shoot in DX mode.