I fire one or both of my old Sunpak 3600's with my istDS by jerry-rigging a "peanut slave" in front of the istDS flash, blocking off the istDS flash from spilling onto the object. The slave fires the strobe(s). However, I can set the 3600's to a given F stop and they will put out the appropriate amount light. Set the istDS to manual at the needed F stop and shutter speed (no more than 1/140 I think ... check the manual).
Third party flash unit on Pentax *ist DS
in Pentax
Posted