yeah i see here and there, they say ST-E2 can trigger 580EX, 550EX,420EX, and MR-14EX.
well i usually trigger my 580EXs and 420EXs with that ST-E2. but recently i got a MR-14EX but i can't trigger it remotely (no where in the manuals say about that)

does anyone know how to trigger a MR-14EX with a ST-E2??