1Product Usage: The reducing adapter ring can be installed in front of the lens, allowing different aperture lenses to share the same filter, hood, additional lens, or for increasing the lens aperture. 2Specification: The small aperture has male thread, connects the lens end, the large aperture has female thread, connects various aperture UV filter, CPL, starlight scope, ND, close up lens, lens hood, etc. 3Easy Installation: The filter adapter ring features large to small aperture design, lightweight and portable, easy to install and connect, saving costs, and can improve part of the dark angle problem. 4Aluminum Alloy: The camera lens adapter ring is made of excellent aluminum alloy material, which has high strength, oxidation resistance, light weight, and greatly extended service life. 5Compact Design: This metal filter converter has a compact size and lightweight design, which will not increase the burden on the camera lens after installation, so you can use it with confidence.