Specification Brand : Pixco BulletPoint1 : Smooth surface for effortless mount,infinity focus allowed.The adapters are precision made to insure the perfect fit BulletPoint2 : Made of aluminum ,Diaphragm control of the lens is set manually BulletPoint3 : Compatible Cameras Lens:B4 Mount Lens BulletPoint4 : Compatible Cameras: Canon EOS R BulletPoint5 : This adapter gives you the ability to use your irreplaceable prime lens ExternallyAssignedProductIdentifier1 : 0632088801103 ExternallyAssignedProductIdentifier2 : 632088801103 ItemName : Pixco Lens Mount Adapter Ring for B4 Lens to Canon EOS R Mount Camera ItemPackageDimensions_Height : 9.4 centimeters ItemPackageDimensions_Length : 5 centimeters ItemPackageDimensions_Width : 9.1 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : camera-lens-adapters Manufacturer : Pixco ProductDescription : Features: This adapter gives you the ability to use your irreplaceable prime lens and saves you the cost of purchasing new lenses The adapters are precision made to insure the perfect fit. Allows focus infinity. Diaphragm control of the lens is set manually. High quality and compact. Made of aluminum Suitable for: B4 Mount Lens Canon EOS R Mount Camera Note: Please note Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter. In this case "Stop-down mode"will need to be used when metering since the lens doesn't have the ability to have its apeture controlled by camera body. You can shoot with manual mode or apeture priority mode. Set your camera to"shooting without lens"mode Package Includes: 1X B4 to Canon EOS R Lens Mount Adapter Ring ProductSiteLaunchDate : 2018-11-07T08:00:00.000Z SupplierDeclaredDgHzRegulation : not_applicable