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

M42-PK M42 Thread Lens to PK Mount Metal Stepping Ring
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.