There is no ROM connection on the ring so diaphragm control of the lens is set manually.
It is possible to use Macro rings and other accessories.
P.S.: Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using this adapter.
In this case “stop-down mode” will need to be used when metering since the lens does not have the ability to have its aperture controlled by the camera body.
You can shoot with manual mode or aperture priority mode(A/V).
Camera: Pentax PK DSLR and Film SLR
Ricoh, Chinon, Cosina, Sigma, Pearl River, Phinex
(as long as the body takes Pentax PK lens)
1.Put red marks of the adapter and lens collar together.
2.Turn the adapter clockwise till the fixative click.