It is strange, and a bit frustrating. I just copied down all my settings, reset custom, reset camera defaults, and no joy. I'm starting to think I'll have to call Pentax, but I'd really prefer to solve it myself.
So, just to recap, using 1/2 EV steps, the fastest I can use the flash is 1/125th, and using 1/3 EV steps, the fastest is 1/160th.
Edit: So, I just tried some other things. I tried my equally old but standard Vivitar flash (as in, not a ring flash), and it worked at 1/180th. So then I put the ring flash back on and tried it again, and the damn thing started working.
Maybe the connection on the little Hama block wasn't perfect, or maybe the cable, I haven't a clue. The thing was stubbornly not working since I received it, even after removing it and its cable, and reattaching it all. I'm glad it works, but I'm very puzzled by this. Does anyone know if the camera sends a different (weaker/strong/shorter/longer) signal to the flash when using different sync speeds?
Anyway, consider it solved.
Thanks for the replies.
Last edited by Philoslothical; 04-05-2012 at 03:16 PM.