I am trying to use this with a couple of Panasonic point and shoot cameras (DMC FZ-20 and FZ-47). The cameras' built in flash have a preflash which triggers the slave prematurely. AFAIK there is no way to disable the preflash. Is there anyway around this issue with this particular slave?
It seems there is no way around the preflash using the popup flash. Try using an inexpensive flash unit in the hot shoe which will bypass the popup. A unit like the Sunpak 2000 should work (available from Adorama). Be sure you use manual and cut the flash power (by experiment) as you are using slaves. The light must be balanced for multiple units or your photos will be way overexposed. Nikon's iTTL and commanders adjust for this but you will be on your own. Try using half or quarter power and remember light falls off inversely as to the square of the distance. The little trigger works beautifully, what a buy for $15!