Autum Colures

Beautiful.

Both the *istDS and the K5 are incurably addicted to old glass
Thanks for the comment Paul
David about old class looking at old class for my K1 11 that I just bought mint condition less than 200 photos taken very happy with it I have 55-300 PLM and the 28-105 WR looking at a prime around 20mm as the the new 21 is really expensive don't know much about old class but would want something sharp at least between 8 and 11 for landscapes any thoughts greatly appreciated

Widest I have been is the SMC Pentax-A 24-50. It's nowhere near what you have specified but it really is a stunning performer. Meyer Optik Lydith at 30mm is another magnificent performer. Old folding cameras are out because if you go wider than 75mm then all you get is a macro lens. That leaves you with a very very small number of super wide offerings on Ebay. They rarely come up and they are invariably expensive when they do. 20mm Takumars start at about £150 and Flektogons at about £350. There is presently nothing at 10mm (I just looked).
The fellow who would possibly know more about what can be had is LennyBloke - he has a thread on the forum right now about the FA21.

Agreed - no other words needed