Features: Made of good quality alloy, lightweight and durable for long-term use. Precision machining, ensures perfect fit for your cameras. Although the lens will fit physically, automatic diaphragm (AE metering), or other auto functions are not retained using this adapter. Both camera-side and lens-side of the adapter are made of brass, precision-machined and plated with chromium. Precise fit and solid connection - lens has no play, wiggling when mounted on adapter and no adjustments are required to fit your lens. Designed to reach infinity focus while maintaining the correct registration distance required to support CRC lenses or lenses with floating elements. Compatible with M42 Screw Lens and C Mount Lens. Specifications: Condition: 100% Brand New Material: Aluminium Alloy Weight: Approx. 27-31g / 1.0-1.1oz Optional Type: M42/C-NEX, M42/C-M4/3, M42/C-FX Package list: 1 * Lens Mount Adapter Ring 1、Made of good quality alloy, lightweight and durable for long-term use. 2、Precision machining, ensures perfect fit for your cameras. 3、Although the lens will fit physically, automatic diaphragm (AE metering), or other auto functions are not retained using this adapter. 4、Both camera-side and lens-side of the adapter are made of brass, precision-machined and plated with chromium. 5、Precise fit and solid connection - lens has no play, wiggling when mounted on adapter and no adjustments are required to fit your lens.