dedicated transceiver or use camera flash to trigger flashgun?

[wideangle]

So will an on camera built in flash trigger multiple off-camera flashguns?

[I @ M]

So will an on camera built in flash trigger multiple off-camera flashguns?

As in the above advice that you have been comprehensively given by others ---- yes, an on camera flash can trigger multiple off camera flashes IF there are no obstructions to the optical path, you are prepared to accept that some light from the on camera flash might influence the exposure and that the off camera flash units have the ability to be triggered optically.

You really need to be more specific about what camera will be used, what flash units will be used, how many of them will be involved and how far they will be from the camera otherwise you will be going around in circles trying to work it out.

[wideangle]

Just trying to get my head around why an on camera flash can trigger multiple off camera flashes, whilst if you went a radio trigger why you need one for every single flash that you want to trigger.

As in the above advice that you have been comprehensively given by others ---- yes, an on camera flash can trigger multiple off camera flashes IF there are no obstructions to the optical path, you are prepared to accept that some light from the on camera flash might influence the exposure and that the off camera flash units have the ability to be triggered optically.

You really need to be more specific about what camera will be used, what flash units will be used, how many of them will be involved and how far they will be from the camera otherwise you will be going around in circles trying to work it out.