Sigma USB Dock for Nikon F mount lenses b&w 4 aperture and a handy

4 aperture and a handy manual/autofocus switch built into the lens

8 Zenzanon-PS lens

but supplied here with an adapter for use with the much more common M42 lens mount

easy to use controls

Sigma USB Dock for Nikon F mount lenses b&w 4 aperture and a handyThe Sigma USB dock is a peripheral that allows the user to perform firmware updates on compatible Sigma lenses, and if that's not handy enough, it lets you fine tune certain focus settings to better match your lens and camera. This dock is designed for Nikon F mount lenses. Please note: this dock only works with compatible Sigma lenses. It does not work with all of them! If you have other brands of lenses, this dock won't work on them, either. It is