Description:Make of metal Please installing / uninstalling the adapter after turning off the camera It can focus to infinity. Auto focus (AF) is not available M42*0.75 screw for double ring design Specification: Material: Metal Size: Approx. 70*70*20mm / 2.75*2.75*0.78inch Suitable for: Lens: all T/ T2 mount device, e.g. Microscope / Telescope / T mount lens / Slider Copier... Cameras: for Nikon DSLR D4S D4 Df D3 D3X D3S D810 D800 D750 D700 D610 D600 D300S D300 D200 D100 D7200 D7100 D7000 D5500 D5300 D5200 D5100 D5000 D3300 D3200 D3100 D90 D80 D60 etc. Settings: Put red marks of the adapter and lens collar together Turn the adapter anticlockwise till the fixative click Mosty it will use Manual or AV mode Removing: To remove the adapter you should unpress fixative pin and turn the adapter clockwise. Package Includes: 1 Piece Adapter Ring for T2-Nikon Mount Note: 1. Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other function will not operate correctly while using this adapter 2. In this case "Stop-down mode" will need to be used when metering since the lens doesn\'t have the ability to have its apeture controlled by camera body 3. You can shoot with manual mode or aperture priority mode