Feature: 1. The focus ring is the best choice for magnifying or altering lenses. It provides a focusing system for lenses without a focusing system. 2. It can also be used as a macro tube to provide fine focus control for macro photography. 3. Support 17‑31mm/0.7‑1.2in focusing range, provides a 14mm/0.6in adjustable distance for lens focusing. 4. This focusing helicoid tube is made of good aluminium alloy, black anodized for longer service life and excellent hand feel. 5. Extinction treatment on the inner side to avoid reflections affecting imaging. 6. The for M65 helicoid interface is universal and easy to transfer, make the idle old lens can also be used for digital camera shooting. Specification: Condition: 100% brand newItem type: Focusing Helicoid AdapterMaterial: Aluminium AlloyColor: BlackWeight: Approx. 87g/3.1ozFocusing Range: Approx. 17-31mm/0.7-1.2in Interface: Male Mount: for M65 Helicoid Mount Female Mount: for M65 Helicoid Mount . Package List: 1 x Focusing Helicoid Adapter