Focusing Helicoid Adapter 17‑31mm M77 to M77 Aluminum Alloy Focusing Helicoid Tube Black Lens

Feature： 1. Focusing Range： The length of the focusing distance is 17-31mm, providing a 14mm adjustment distance for lens focusing. 2. Extinction Treatment： The inner wall of the focusing cylinder is treated with extinction to avoid the impact of reflected light on the imaging. 3. Great Choice： Provides a focusing system for lenses that do not have a focusing system, ideal for zooming in or changing lenses. 4. Premium Materials： Made of aluminum alloy, black anodized, sturdy, durable, long service life and excellent hand feel. 5. M77 Threaded Interface： Adopt general M77 threaded interface, strong versatility and convenient transfer. Specification： Item Type： Focusing Helicoid Adapter Material： Aluminum Alloy Colour： Black Focusing Range： 17-31mm Interface： Male Port： M77 Threaded Mount Female Port： M77 Threaded Mount. Package List： 1 x Focusing Helicoid Adapter