【NEW COMPATIBLE】Compatible with M42 42mm mount lens (NOT Fit Mamiya and Fuji 42 mm lens), compatible with Canon RF mount cameras. Using the PHOLSY adapter, you can mount the M42 lens on your digital RF-camera instead of the RF-lens, and explore new lens combinations | 【NEW DESIGN】Made of hardened aluminum and copper, anti-reflective and matt coated on the inside. Easy to mount and dismount | 【MANUALLY ADAPTER】Focus to infinity. When using the PHOLSY-adapter, no mechanical or electrical functions, signals or data are transferred between EOS RF system cameras and lenses. So have to manually adjust all settings (no autofocus, aperture and exposure ) | 【NOTE】If your camera indicated "lens is not properly installed", please modify the camera menu settings, you can modify the settings to allow. Menu-Settings-Release without lens-Activate. Specifically refer to the camera manual | 【CUSTOMER SUPPORT】If you are unsure whether a lens adapter fits your camera and lens, please contact the seller's support by email before purchase. You can find your lens and camera mount in the lens's and camera's original user manual. Or find your lens and camera on the manufacturers' website and under the product specifications look for “mount type”.