Description: It allows you to make M42 mount lenses and macro accessories for Nikon SLR/DSLR cameras. The lens distance scale can be used as well as the focusing to infinity and the adapter has correction lens inside. Features: The adapter adopts quality metal material and it's crafted with fine machining, sturdy, anti-deformation, anti-rust, durable. With corrections lens inside, the lens has multiple optical coatings, which would not affect the quality of images. This lens adapter supports manual focus to infinite. Precise thread cutting ensures perfect fit to cameras without affecting other functions. Useful tool for you to make M42 lens suitable for Nikon AI mount cameras. Specification: Material: Alloy Color: Black Size: Approx. 5.5 x 1.2cm / 2.2 x 0.47in Weight: Approx. 19g Suitable for Nikon AI mount cameras Package List: 1 x Lens Adapter 1、The adapter adopts quality metal material and it's crafted with fine machining, sturdy, anti-deformation, anti-rust, durable 2、With corrections lens inside, the lens has multiple optical coatings, which would not affect the quality of images 3、This lens adapter supports manual focus to infinite 4、Precise thread cutting ensures perfect fit to cameras without affecting other functions 5、Useful tool for you to make M42 lens suitable for Nikon AI mount cameras