Hello, just signed up from Belfast I have used old s.l.r Pentax cameras when younger and am using a K30. I recently got out my old Tamron adaptall 28mm and being quite pleased with the results just got a ricoh Rikenon xr f1.7 50mm on Ebay. Iwondered could some of your contibuters give me an opinion on whether they think the lens is any good. It is difficult to get the lens precisely focussed. I suppose autofocus makes us a bit lazy!I'll try to post some of the first pictures I took to test it out a couple of days ago.unsharp masked a little bit. Does anyone know if you can perform lens adjustment on the K30 for lenses other than Pentax such as my Sigma 18-250mm zoom? The instructions I have seen are vague. If anyone can direct me to a simple list of instructions I'd be grateful.