With this kind of ring/adapter, I can use my M42 screw mount lenses/zooms on my manual focus, auto focus or digital SLR camera bodies with Pentax K or Pentax auto focus mounts.The adapter is easy to use: 1) install the adapter first onto the body; 2) screw on the lens/zoom; and 3) to uninstall, take the lens/zoom off first and then take the adapter of.
The Pentax brand ring is more expensive than the ring by other manufactures, which often comes with an extra wrench/key for installation/un-installation of the ring.
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