This adapter is compatible with for Techart LM-EA7 lens adapter.When you use two adapters together, the combination of the two adapters can make the M42 lens an autofocus lens.This M42-LM adapter does not affect any camera functions, it does not support autofocus.Good processing ensures a perfect thread, it can be installed between the camera body and the lens without any tools.Suitable for M42 mounting lens and for Leica M mounting camera.Made of stable alloys and plastics, light weight, durable, and long-term use.Compatible lens: for M42 mount lens compatible camera: for Leica M mount camera compatible lens adapter.Suitable for Techart LM-EA7 lens adapter.Item Name: Adapter RingMaterial: Alloy, PlasticFeatures: Durable, Easy to Install, Camera AccessoriesSize: 5cm x 5cm x 2cm/1.97" x 1.97" x 0.79" (Approx.)Notes:The M42-LM adapter does not support auto focus lenses.Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Adapter Ring