Item Type: Lens Adapter_x000D_ Material: Alloy+Optical Glass_x000D_ Color: As Pictures Shown _x000D_ Weight: Approx. 22g/0.8oz_x000D_ Type: Full manual adapter ring_x000D_ Mount: M42 Mount, AI Mount_x000D_ Compatible lens: for Pentax/Praktisix M42 screw mount lens_x000D_ Applicable camera: for Nikon AI mount camera body, for example, Fit for Nikon D850, D810, D750, D7500, D6500 camera, etc._x000D_ _x000D_ _x000D_ How to use: _x000D_ 1. Align the identification point of the lens mount with the identification point of the adapter ring and rotate it clockwise. When you hear a "click" sound, it means the lens has been installed in place_x000D_ 2. Align the identification point on the lens adapter ring with the adapter ring to the identification point on the fuselage, and rotate clockwise when you hear a "click" sound, it means it is installed in place_x000D_ 3. Press and hold the camera lens release button and rotate it counterclockwise to remove the lens together with the adapter ring_x000D_ 4. Push the adapter ring release button and rotate it counterclockwise, the adapter ring can be removed from the lens 1For Pentax/Praktisix M42 screw mount lens can be mounted to for Nikon AI mount camera body through the M42?AI adapter ring. 2Made of high?quality alloy, it is sturdy and durable, the surface is painted to prevent oxidation and corrosion, and it feels comfortable. 3Precise processing, tight fitting, precise fitting and no light leakage. 4With corrective lenses, multi?layer coating, infinite focus. Suitable for Nikon D850, D810, D750, D7500, D6500 camera, etc. 5It is tightly and smoothly combined with the mount, easy to install and remove the lens.1 x_x000D_ _x000D_ Lens Adapter