Andoer Andoer Metal Step Up Adapter Ring for Leica M39 Lens to Pentax Spotmatic SP S1a M42 Camera Solid metal mount lens adapter allows Leica M39 lens use on M42 camera body. Made of high quality anodized black aluminum (metal). Extremely solid and lightweight. Specifically designed for your camera for a tight and secure fit. A must have accessory to unlock the full potential of your camera!