I've been investigating wireless E-TTL flash photography for multiple flash use to give me more lighting options for sports (mountain bike) shots.
The first prize seems to have a master-capable flash unit like the Speedlite 580EX but these don't come cheap
. I then came across the Canon Speedlite Transmitter ST-E2 - does anyone own it or have experience using it?
What I can't establish is if the transmitter has to have direct
line-of-sight with the 'slave' flash or if it's IR pulse will be detected within more practical, broader area. I'm thinking of situations where you would want to set up the slave flash to side-light the subject etc. (I'm wondering if branches etc. would block the signal.)
It looks like the outdoor transmission range for the ST-E2 is 3.5-5m, with coverage of about 40° horizontal and 30° vertical.