Originally posted by Eruditass I'm pretty sure this will work.
My K-5 has been returned, but I did test a Sigma EF-530 in the hotshoe with P-TTL and a wireless trigger on the PC Sync port, and they both fired (except the trigger above 1/180 even with HSS, which was what the test was for).
If i understand you right, you had a radio(wireless) trigger on the sync port and PTTL in the hot shoe. Since the only Pentax radio triggers out there do not have PTTL, one would be firing one flash in manual and one in PTTL off the same signal. I just wonder if the main flash would be simultaneous. Apparently yours was which is great.
The YN560 has those 2 optical trigger modes, S1 and S2, so thats an alternate way to have both TTL and manual at the same time as well. only con is where the PTTL flash can't reach the optical trigger
I think i'm going to have to get a PC cable - any sources - fleabay i suppose.