Purchased used in 2021 and used until January 2025. I have used it with the Canon EF100mmF2.8 Macro USM and the Canon EF100mm F2.8L Macro IS USM, but it seems to be usable with RF and Nikon 105mm macro lenses as well. It is currently discontinued. Due to carelessness, the screw threads of the M67 diameter mount at the tip of the port (screw-in type) were stripped, making it impossible to attach a close-up lens, so I am selling it. → Please check photo 4. It can be used without any problems for those who do not use a close-up lens. There is a stain on the port surface, but it does not affect shooting. → Please check photo 6. There are scratches on the bottom that touches the ground. → Photo 3 Please inspect the O-rings yourself and replace them if necessary. There are two, as they are split into two parts. Especially the port base and the port part are screw-type and tight, so a belt wrench might be helpful. Be careful of water submersion due to O-ring twisting. If you purchase it at the same time as the focus gear currently being sold, I will discount it by the shipping cost, so please comment.