Features: new and high quality With this adapter, you can Modify m42 mount large format or enlarging lens for EOSR RF Camera. M42 mount large format or enlarging lenses with focusing tube and this modify lens adapter, use for camera. Modify lens purpose, can not focusing infinitely when used directly. Fine finishing Install, remove and operate lens smoothly Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter. Specifications: Material: Aluminium Color:Black Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Lens Adapter