Feature 1 The ring is made of good quality material, anti-rust, sturdy and durable 2 Precision machining ensures perfect fit for your lens and camera, easy to install 3 Supports manual operation olny, aperture-priority, doesn't support infinite focusing 4 The Max. shooting distance depends on the type of lens, but usually less than 30cm 5 Suitable for Canon EF/EF-S mount lens and for M42 mount cameraFeatures: The ring is made of good quality material, anti-rust, sturdy and durable. Precision machining ensures perfect fit for your lens and camera, easy to install. Supports manual operation olny, aperture-priority, doesn't support infinite focusing. The Max. shooting distance depends on the type of lens, but usually less than 30cm. Suitable for Canon EF/EF-S mount lens and for M42 mount camera. Specification: Material: Alloy Color: Shown as picture Suitable for Canon EF/EF-S Mount Lens Suitable for M42 Mount cameras (compatible for Zeiss, Pentax, Praktica, Mamiya, Zenit) Diameter: Approx. 6.5cm / 2.56in Weight: Approx. 68g Package List: 1 x Lens Adapter Ring