I decided to make a magnifier for manual focus on my camera and purchased a "Vixen Multi-Monocular H4x12." This is something I prepared at the same time. Ultimately, I sold that camera, and this item remained. In that sense, it is unused. I hope it can be of use to someone. I am also listing a separate step-up ring (27mm to 37mm). ↓ #BB Magnifier Production