I just discovered today, that if I mount my Vivitar 185HV on a handle mount, with an optical slave and trigger it off with the in-build 10D flash set at -2 stops, no matter what shutter sped I use (down to 1 sec), I simply can't get the flash to sync with the shutter. Also tried conncting the slave via cable to the flash, and triggered it using the in-built flash. Niente. No goh. Buay Sai sync.
Did anyone encounter this before, and what are all the possible ways if I want to continue using my non-digital flash off-camera?
BTW, when I mount it in the hotshoe as normal, it syncs fine, but besides wanting an elevated angle of light, I'm afraid of frying my 10D.
Any opinions...any Electronics Engineers out thre can help, please?