3X M42 to M42 Adjustable Focusing Helicoid Macro Tube Adapter 25-55mm

Solid all-metal helicoid adapter that converts M42 lens to M42 mount while adding 25–55mm of extension for close-up work. The unit clamps securely to the lens yet detaches quickly when you want to go back to normal shooting. Designed especially for lenses that lack a focusing ring, it doubles as a macro extension tube to bring subjects closer. There are no electronic contacts or circuitry in the adapter; both aperture and focus must be set manually on the lens. Durable build and a smooth adjustable focuser make it a simple mechanical solution for macro photography with M42 lenses.