This is a High Quality F1.7 C-mount TV 35mm Lens. The Film Lens can be used on most C-mount camera. This product is small in volume, good-looking exterior and reliable in performance, it will truly provide convenience for you, and it's very easy to use. It's a tricky-looking device, and it's pretty amazing how you can point the front of your camera at an image and get the exact duplicate of that image inside your camera. A camera lens is actually much like the lens of the human eye, which requires light to see the images produced in front of it. The pupil of the human eye can dilate open and shut to adjust the amount of light it needs to process an image. This is the same with a camera lens. It is very simple and will not cost you much to be able to use your film camera lenses on your new digital camera, provided your digital camera is an SLR camera that has interchangeable lenses.