Screw adapter for DSLR

I have a couple of screw type lenses that fitted my old Spotmatic. I bought an all metal adapter with a view to attaching the lenses to my K10 or K7.
Does anyone know if using these will harm the electrics?

There is no problem. The Pentax Adapter K is the best one to use as it allows infinity focus.

Enjoy your screw thread lenses!

I echo Johns sentiments...

I use a Sigma 500mm mirror on a K ring and its a great little bit of kit. Can't remember how much it was as I have had it for years.