K&F Concept Lens Mount Adapter Bronica SQ Lens to Nikon Camera Mount Pro Adapter Allows to use Bronica SQ lens to Nikon camera body. High quality provides great protection and shock absorption for your lenses, water-resistant. Package includes: 1 X Ring Adapter Mount Please note: Infinity focus positionthe position of the infinity mark of the telephoto lens or super telephoto lens is shifted slightly to the positive side to enable focus adjustment even when focus shift is caused due to temperature changes.The shift range is denoted by an L-shaped line, Be sure to check the focus through the viewfinder even when you shoot at infinity.