Shelf Bracket -Pentax K Mount Body Adapter Ring Highlights Generic Brand Pentax K Mount Body Adapter Ring Description: 42mm M42 screw lens adapter ring with tool. Suitable for Pentax pk-mount digital SLR cameras. Full manual control, manual focus, manual exposure, aperture priority, infinity focus. M42 screw mount lens installed on Pentax K mount camera. Brass material, precision cut, anodized aluminum construction for long time use. Specification: Material: Brass Diameter: 42mm / 1.65inch Package includes: 1x Lens Adapter Ring Note: Instructions: 1. Use thumbnail first to hold lens triangulation reed next to the ring, do not let go. 2. The red dot on the ring is aligned with the red dot on the body mount and the ring is placed in the body mount. 3. Keep holding the reed with your thumb and don't let go, and turn the ring clockwise. 4. Turn to the inability to turn, release the reed, bounce it, lock the ring on the fuselage, then rotate the objective on the ring and start shooting. 5. When disassembling, first press the lock reed with the nail to unlock it. 6. Turn the ring counterclockwise until it stops.