New M42 mount adapter. Used old lenses are becoming increasingly popular among camera enthusiasts using mirrorless cameras and digital SLR cameras. Among them, the M42 screw mount lens is arguably the representative of old lenses. When using an M42 mount lens with a mirrorless camera or SLR camera, a mount adapter is always required between the lens and the body. Lens side: M42 screw mount Body side: Canon EF mount This mount adapter for Canon SLR cameras can be attached to Canon SLR cameras. ◎Canon EF mount models ・5D, 6D, 7D, 90D, Kiss series, etc. ※This mount adapter is for SLR cameras, so it cannot be attached to the same Canon mirrorless cameras. ◎Main famous M42 mount lenses ・PENTAX Super Takumar 55mm F1.8 ・PENTAX Super Takumar 28mm F3.5 ・Helios-44 58mm F2 ・Yashica Auto Yashinon DX 50mm F1.7 If you are unsure whether it can be attached to your SLR camera, please feel free to ask. Price negotiation is not possible. Thank you for your understanding.