This is a lens for an underwater camera housing. I am selling it because I no longer have the opportunity to use it. It is a 28M67 type 1 mount. It was used with the Olympus PT-054 housing for an underwater camera and the digital camera XZ-2. I purchased it around 2015 and used it for diving about several dozen times. There are minor scratches on the lens and scratches on the outer frame. Please check the images. This is a used item, so please understand. Thank you.