0.5X C Mount Adapter: This Item Is A 0.5X C Mount Adapter For Connecting A Ccd Camera Or A Digital Eyepiece To A Microscope. Two Adapters: 23.2 Turns To 30 Mm And 23.2 Turns To 30.5 Mm. Effects: Compact With The Lens Barrel So That The Insertion Depth Can Be Easily Controlled. Material: Metal Good Light Transmission: Lens Blue Anti Reflective Coating, Increased Light Transmission. Usage: It Can Be Used In Any Eyepiece Position Of 23.2Mm Or 30Mm Or 30.5Mm And 0.5X Magnification To Achieve A Wider Field Of View., Weight: 0.3086471668 Pounds, Manufacturer: SEAFRONT