Features: Brand new and high quality High quality and compact with an ultra-smooth finish Durable, portable, and lightweight construction made of aluminum Allows for infinity focus Adjustable aperture scale Manual operation for focus and manual exposure control Offers high quality and durable performance Specifications: Material: All metal Product model: M42 inner ring with adjustable design Compatible lens: M42 mount series lenses Compatible cameras: Designed for use with digital SLR cameras, some full-frame, and film cameras; may not be suitable for all models due to potential vignetting Product Features: Full manual control, manual focus, supports infinity focus Notes: When using the adapter ring for the first time, enable the "Shutter Release Without Lens" option in the camera menu; otherwise, the camera may not recognize the adapter Please allow 0–1 cm variation due to manual measurement. Ensure you are comfortable with this before purchasing Due to differences in monitor displays, the actual item color may vary slightly from the images shown Package Includes: 1 x M42 Lens Adapter Ring