Adapter C-Mount Telescope Lens Video Camera Barrel Ring Adapters Standard C Thread For Telescope Camera Accessories Features: and high quality. This adapter makes you attach your video camera with a C or CS thread to your telescope for prime focus photography. C-threads are commonly used in most consumer video cameras whereas the CS thread is mostly used in security cameras. The camera must have a standard removable C-mount lens, which is a 1" diameter thread. Will not work on video cameras with a fixed lenses or bayonet mount. Specification: Color: Black Material: Aluminum Alloy Outside thread: standard C thread (25.4mm) Internal thread: M28*0.6mm Outside diameter: 1.25in (31.7mm) Dimensions: 9*4.5*3.1cm/3.5*1.8*1.2in Weight: Approx. 19g Packing list Package List: 1 x Adapter