1. Function: Connection2. Material: Aviation aluminum3. Features: Full manual control, manual focus, aperture priority, infinity focus4. Bayonet size: T25. Applicable camera: For Pentax SLR camera6. Applicable lens: T-mount telephoto lens/Reentrant lens7. Packing list: adapter ring, L wrench Nikon Camera, Telephoto Lens, Anti Dust Plug, Filter Camera, Camera Nikon, 3d Printer Machine, Slr Camera, Cable Charger, Mac Accessories