M42 Electron Lens Adapter Screw Mount for Canon EF EFS DSLR Camera Lens Accessory Item Type: M42 Lens Adapter Material: Alloy Weight: Approx. 67g/2.4oz Color: SilverFitment: for M42 mount lens              for Canon EF/EF‑S DSLR camera, support manual focusing, fit for all kinds of                        digital camera and partial film camera(for 100D.1100D.1000D.300D.350D.400D.450D.550D.600D.650D.700D.10D.20D.30D.40D.50D.60D.70D.5D.5DII.5DIII.6D.7DII series)Installation Method: 1. Install the transfer ring on the lens:First place the corresponding lens at the mount of the adapter ring, align the white dot on the lens with the red dot at the front of the adapter ring, and then tighten clockwise until you make a click, and then finish.2. Install the transfer ring and lens on the camera:Turn off the camera power and align the mounting interface of the adapter ring with the interface of the camera, so that the red dot on the back of the adapter ring is aligned with the red dot on the camera lens interface.Then, tight the adapter ring and lens clockwise until it clicks, and then finish.3. To remove the adaptor ring and lens from the camera, press the lens release button on the camera and twist the adaptor ring counterclockwise. Instructions: 1. First, set the Settings in the camera menu: open "Shooting without lens" or "Shutter release without lens" e the transfer ring.2. Focus with LCD, all manual focus.3. Use MF to zoom in and focus, 7 or 14 times zoom in and focus to achieve the focus function.4. You can shoot in M or A mode.