i have just read on another site that this setup is useless outside.
Hi Stuart
In many situations and setups the above statement could well apply.
However, in many others it can work a treat.
Used in interior locations, the command signals can bounce off walls and stuff, but exterior situations lack these handy reflective surfaces. Direct sunlight on the receiver window can also occasionally be an issue (unless you flag it off), plus signal strength drops off as the distance between the units increases.
But all is not necessary lost if you bear in mind that ideally the receiver needs to be able to see the transmitter in clear line-of-sight, without obstructions in the way. These obstructions can be things like people, trees, soft box reflectors and shoot-through brollies, or even the body of the flash unit itself.
Don’t forget that you can often maintain good line-of-sight by simply twisting the flash heads in one direction and the body in another, so that the heads are pointing where you want them (at the subject usually), but the receiver and transmitter windows, located on the flash bodys, are pointing at each other.
If you need further help then draw me a diagram of how you would plan a typical setup.
I hope this is helpful.
Sam-D