Features: Enhances your photography precisions with the focusing Assist rings, from silicone for superior grip and precise manual focusing adjustments in low light or complex shoots scenarios. Featuring universals mounting systems for DSLR and lenses, this toolless accessory installs in seconds while maintaining nonslip stability during rapid focusing . for professional photographers and videographers seeking tactiles control, it bridges between automated systems and hands on creative workflows. Perfect for astrophotography, fast paced event coverage, or macro shoots where millimeter levels accuracy determines image clarities and artistic impacts. The innovative adjustable damping mechanism in select models allows customization of rotational resistance, transforming standard lens into cinemas focusing tools for filmmakers and content creators. Specifications: Materials: Silicone Diameter: 64mm, 50mm, 44mm(optional) Package Includes: 1PC focusing Rings note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.