For using all M42 screw mount cameras with T-mount telephoto lenses, such as telescopes, mirror lenses, etc. It supports infinity focus. Please note that the pusher with the fixed ring does not work, so diaphragm control of the lens must be set manually. It is possible to use macro rings and other accessories. It can be used with other M42 mount adapters to fit various camera models. Not recommended for modifying T-mount camera lenses. Installation: Align the red marks on the adapter and lens collar. Turn the adapter clockwise until it clicks into place. Attach the T-mount lens. Removal: To remove the adapter, press the release pin and turn the adapter counterclockwise. Constructed from a combination of aluminum and brass for durability and precise infinity focus. Allows maintenance of infinity focus capability. Made of metal. Color: black. Package Included: T2 lens to M42 adapter x 1 Note: 1. Due to lighting and screen differences, the item's color may vary slightly from the images. 2. Please allow 0.5–2 cm variation due to manual measurement.