Originally posted by Lloydy Of the 7 or 8 that I've got most have the spring removed and tightly screwed on to my most used M42's, most of which I have drilled or machined a slot in to accept the Pentax mount locking pin, so the lens is fixed and the spring is no longer needed. .......
I finally got the black enamel adapter. It has no spring. It has first to be screwed on to the lens, then it takes some manoeuvring to fit the lens to the camera mount, twisting clockwise to lock, as there is no mark to line up with the orange dot.
Looks like I can get infinity focus, aperture priority in AV mode and stop-down metering with the green button in M mode. Focus confirmation is present at most aperture settings.
Pressing the lens release button and turning the lens anti-clockwise enables the lens with the converter fitted to be removed from the camera. I find the both the clockwise and anti-clockwise movement a little stiff for my liking. Equipment used: Samsung GX20; Carl Zeiss Jena Flektogon 35mm f2.4. The seller said that the converter was made in Belgium.
Many thanks to all who pitched in with advice, Lloydy in particular.
Chhayanat