Hi, can the Canon 277T Speedlite be used as an off-camera remote flash unit using an optical slave trigger?
I am trying this set-up: my Canon 277T is mounted in the hotshoe of a Nisha Programmable Digital Slave Unit (FSU-DIG), which is an optical slave trigger -- but the 277T is NOT firing at all. 
I've tried both Program and Manual modes on the 277T; and I've already "programmed" the Nisha unit to the on-camera flash head that I'd like to fire it in synch with (i.e., to ignore pre-flashes)....
Does anyone have a suggestion? Is there a website for the manufacturer, Nisha? Thank you.
