Experimenting with Pentax-110 film lens ... on Fuji X mount (which works great), but also on the full frame K-1. I home-made an "adapter" by crudely cutting a hole in a black plastic flexible K-mount body cap.
The 18/2.8 and 24/2.8 will cover the FF sensor but maximum focus distance is null. Maybe 2" for the 18mm and maybe 3" for the 24mm.
But the 50/2.8 will maximum focus at about 12" and this was shot wide open, since there is no aperture present on the Pentax-110 film lenses. It's in the camera body ...
Just a first very quick try in my kitchen with a flower bouquet ... more and better images once I find a good moment.