External camera flash

If your flash is more than, say, 10-15 years old, do a little research to make sure it is safe to directly hook up to a modern digital camera. Some old flashes can fry the electronics of a digital camera.

 Some strobes (and infrared strobe triggers) use high voltages in the trigger circuit. For mechanical cameras, this is fine — but many newer, electronically-driven cameras (especially electronic 35mm SLRs like the Canon EOS or for that matter, EOS digicams, like the 300D) can be damaged by excessive strobe voltages.

Strobe trigger voltage 

Mt Sunpak 355AF is EOS safe so I can use it on my Canon 35m film cameras and my digital cameras.