Canon EF 300mm f4L USM brand_Blackrapid Leitz 0 UV filter for

Leitz 0 UV filter for A36 slip-on mount

but you can rotate it so that the flash tube is vertical or horizontal- and it includes a diffuser panel for wide angle lenses (to 28mm)

Lens boards for cameras such as the Toyo-View 45C

pressure plate has some surface oxidation which will not affect function

and instruction manual

Canon EF 300mm f4L USM brand_Blackrapid Leitz 0 UV filter forThe Canon EF 300mm f4L USM is a high quality telephoto lens with quick USM focusing and Canon's premium L glass and construction. It doesn't zoom, but it's nice and sharp, and weighs less than Canon's 100 400mm lens plus it's almost a stop faster at 300mm. In excellent condition, with clean glass and only very minor cosmetic wear from light use. Includes caps and hardcase.