Thanks for speedy reply.
The lens arrived today and using your help I got it working straight away.

Thanks again and Merry Christmas

Hi,
I just bought a Tamron 80-210mm Lens (with Adaptall 2) Pentax K mount on Ebay for £8. I know it wont be pro quality for that price. I just wondered if anyone could give me a heads up on the problems I will encounter, using it on my K100d. Or if it wont work at all.
I know the angle of view will change but not sure of situation regarding auto focus/exposure.
Any help gratefully received and Merry Christmas to all Pentax users.