For using PENTAX DSLR cameras with M39 lenses e.g. leica, jupiter, etc.
You should remember that extension ring doesn’t work, diaphragm control is set
manually. This adapter can work with lenses having both only automatic
diaphragm (A) and selector A/M (automatic/manual diaphragm).
It made by aluminium, macro confirmed only, and it can't focus infinity
To remove the adapter you should turn the adapter anticlockwise.
Working with M39 lenses acknowledgement of the focusing is not made. The aperture is
not set. Expo-modes: