Adapter rings for Samsung NX

After my Canon cameras, I bought Samsung NX. Advantage: no mirror, short back-focus and therefore ability to use almost all the lenses in my collection. Disadvantage: the sensor is not a "full frame" but APS-C type. It does not use the full coverage of the lenses planned for 24x36.
As with the Canon, you can find on the Internet adapter rings for all common mounts (and sometimes much less common).
The light metering and the focusing are done directly on the sensor, the aiming is clear even with closed diaphragm.

Obviously, the first ring is purchased for the use of M42 mount lenses.

But the novelty is the ability to also use the Zorki lenses in L39 mount (except Russar MR-2 and Jupiter-12 that do not fit, except on a modified NX100, aborted experience).

I have some K-mount lenses which could only be used with great caution (or dismantling) on a Canon. The purchase of the Tokina 3.5/17mm was the opportunity to buy an adapter for this mount. Adapter that will also allow to use, for example, the Variozenitar 25-45mm as equivalent of a 35-70mm.

Small manufacturing defect of this adapter, it was necessary to introduce cardboard shims between the "base" and the Pentax ring to properly adjust the focus to infinity.

This ring for Canon EOS is useless for EF lenses, since there is no coupling for autofocus, and above all no control for the diaphragm. I just purchased it for "double ring" montages in combination with Canon rings that I already had.

Interest very limited, it is better to buy rings dedicated to the different mounts.