(manual focus) Tokina Lens Problem!
There is a specific menu item towards the end of the 'capture' or 'custom' series. It is set by default to 'NO!' You need to change this to 'YES'. The menu item is sometimes listed in a very cryptic style. On the K5 it is the next but last item under 'custom'.
Once you've fixed it, you will not have any control of the aperture - it can't be done - so you will be shooting wide open.
Otherwise you have to select lenses with a manual aperture ring on the lens itself
quite comprehensive .... http://www.robertsdonovan.com/?p=1181
David
I always shoot in M mode with my old lenses (and often with my new ones too, due to the K200D's erratic metering).
Fan of DA limited and old manual lenses
Many old manual lenses are anodise or lacquered and you need to grind this off on a segment of the lens mount in order for stop down metering to work
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283
you need to grind this off on a segment of the lens mount in order for stop down metering to work
...or put a piece of foil over the contacts.
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