M42-PK M42 Thread Lens to PK Mount Metal Adapter Stepping Ring, M42-PK

1. Made of high quality metal material, durable to use.
2. Let the focus be infinite, but auto focus is not available.
3. Lens locked / released, tighten or loosen screw.
4. Manually setting aperture control of lens.
5. Completely manual control, manually focus and exposure.
6. For Pentax K-3, K-30, K-50, K-5 II, K-5 IIs, K7, K-S1, K-r, K20D, K100D.