D-mount lens with focus ring not focusing on Pentax Q?

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spiffariffic
spiffariffic Forum Member • Posts: 63
D-mount lens with focus ring not focusing on Pentax Q?

Hey folks! Full disclosure: This is my first adapted lens so assume I know next to nothing.

I just got a Kern YVAR 13mm/1.9 for my Pentax Q. I have a d-mount adapter that is a plain metal disc.

This lens has both an aperture ring and focal ring. Both turn smoothly and have stops. The aperture ring definitely works. The focus ring… doesn't?

No matter how or which direction I turn the focus ring, nothing changes. Things only get sharper or blurrier from changing the aperture. Fully stopped down, well, I wouldn't call anything actually IN FOCUS per se but stuff at a distance of a meter+ is sort of focus-y.

Does this mean I need a helicoid or spacer?

If so, which and how do I know which for the future?

PS if you have a favorite Cine/Q-friendly helicoid please share

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