Adapter M42x1 lens to Arri PL camera mount to ARRI Red One Arriflex PL

Works beautifully. Cheapest working option for adapting Russian lenses like the Helios to PL mount cameras. No issue with the focus whatsoever. Very lightweight. If there's anything bad about it, it's so small and thin It could easily be misplaced. I have a pretty heavy lens on it now, and it's holding up very well.