Canon RF 16mm f2.8 STM  type_Cine though the fixing screw is

though the fixing screw is missing

This is a Japan-made AE model

The Zenza Bronica Speed Grip S is an attachable bracket for the Bronica SQ system

Please note: this is not an AR-1 style "over the button" fitting

and the largest corresponds to both the maximum lens diameter and the filter size on the front of the Revoring

Canon RF 16mm f2.8 STM &nbsptype_Cine though the fixing screw isThe Canon RF 16mm f2. 8 STM is a remarkably small full frame ultrawide lens, no larger than a standard 50mm lens but with a much, much wider field of view and a very respectable f2. 8 aperture. In excellent condition, with clean glass and only very minor cosmetic wear.