Sunpak PZ42X (Canon unit) used 
here in manual mode. Set the 
iso/aperture to match the camera 
settings and the unit will auto 
expose at this level. 
Wireless Flash Triggers 
If you have a flash gun with a high guide number and other useful 
features like bounce/swivel but it has a high (more than 30v) trigger 
voltage it might be cost advantageous to purchase a wireless trigger 
system. Very cheap units are available if you do not have a lot of use for 
a more professional set up.  
Such a unit is shown below and can be used to trigger multiple receiver 
units to allow some complex lighting set ups to be constructed using 
multiple flash units. 
 
Wireless flash trigger receiver and 
transmitter unit. 
 
Receiver attached to a powerful Vivitar 
283 flash unit with a 260 volt trigger. 
The units work over quite a large range (50 metres outdoors). As with 
Transmitter fits 
on camera hot 
shoe