Canon ST-E2 and Outside Photography

Hello,

I was wondering if anyone used the canon Transmitter with Speedlights outside on a sunny day before. I believe I read somewhere before (not on this site) that its excellent indoors but when you take it outside especially on sunny days it may not respond because of distance, interferance, or too much sun blocking signal etc etc

Any experiences?
Visuals~

This is true, just depends on how far away you place the flash from the transmitter.