Broadband Green Coated Lens: The 0.5x focal reducer is made of pure optical lens. And the lens is Broadband green coated lens, which increases the light gathering ability and gets bright clear images.Internal Threaded Design: Threaded design in the barrel is user friendly, which can minimize glare and eliminate stray lights during strong light condition.C-mount Adapter: Adapt the focal reducer to a standard C-mount video camera. Wires at the bottom of the c-mount adapter fit the threads on the focal reducer. The threads at the top of the card fit the C-mount of the camera.0.5x Focal Reducer: The 0.5x focal reducer fits into a standard 1.25 inch focus tube, which will give you a much faster focusing with the largest field of view.For CCD Camera for Telescope Eyepiece Photography and Observation.Resistant and Lightweight: Full metal construction is durable and good feeling; Aluminum housing is sturdy and will last a long time. 39g / 1.38oz of net weight will not be an additional burden on your devices.Colour: blackMaterial: metalPackage Contents:1 * 0.5x Focal Reducer1 * C-Mount AdapterOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.