I have a starblitz 3600 DFC flash in working condition. I was wondering if it could be used together with my canon 550d. Will it fry my camera? Thanks!
A quick search revealed this:
It lists trigger voltage at 4.35V, which is safe for modern DSLRs, IF it is correct. You can (and SHOULD) test it yourself if you can get hold of a multimeter (or any form of voltmeter -- should be a high-impedance device to be on the safe side).
Older flashes had high trigger voltages in the 100s of volts which would fry modern DSLR circuits (in theory)