Thank you for viewing. This is an M42 mount to Canon EF mount adapter made by K&F Concept. It allows you to use classic M42 lenses (manual focus, manual aperture lenses) on EOS bodies. The robust metal body provides excellent durability and a good feel when attaching. Since there are no electronic contacts, aperture and focus must be operated manually, but it's a valuable item for those who want to enjoy the character and images of old lenses, whether on film or digital. Please refer to the photos for the condition of the product. It can be attached and detached without any problems. However, please understand that we cannot guarantee compatibility with lenses and bodies, flange back accuracy, or focus. Please consider this a used item. #M42 #EOS #mountadapter #oldlens #EOS #manualfocus #cameraequipment #Canon #canon