Features:Techart LM-EA7 can be connected here to become a auto adapter ring.You can transfer the lens of early L39 screw lens to the M mount camera body for use with it. (For Leica M series paraxial camera, for EPSON RD1, ZEISS IKON ZM BESSA M, and present leica M8/M9/M9P/M(M240)/M-P, etc)Lens and ring are closely connected without gaps and frames.Specification:Options: 50-75, 35-135, 28-90Color: SilverMaterial: AlloyAdapter ring type: L39 screw for LM, VM cameraLenses available: All L39 lensesCamera body: for LEICA LM,ZM VM and all M mount camerasInstallation: rotation buckle typeDimensions: Approx. 5*4*1cm / 2*1.6*0.4inWeight: Approx. 19.2gParameters:28-90 suitable for 28mm and 90mm lenses35-135 suitable for 35mm and 135mm lenses50-75 suitable for 50mm and 75mm lensesPackage List:1 x Adapter RingNote:Three different connectors for different focal length lenses.