If you are looking for safe, wireless way, to trigger your older off-camera Vivitar flash, this could be the solution. This optical sensor accepts a maximum trigger voltage of 100V DC.
I've tried this sensitive, reliable and robust optical slave flash trigger with my Vivitar 283 and it works well.
The approximate range is about 75 ft (22m) or more, depending on the guide number of the Master flash.
This slave will fire your remote flash once light is received from the on-camera master flash. This slave trigger works best in an indoor environment as bright sunlight reduces the range. It requires no additional power.
IMPORTANT NOTICE
Any optical slave can be fooled into early triggering if your Master flash produces a pre-flash for red-eye reduction, for example. In many cases, this pre-flash can be turned off, thereby avoiding the problem.
Sonia
