Eldor Offline Image Upload: On
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Salut, Jean-Yves,
You don't say what makes/models of flashes you are using and that could make a difference. But...
If your second flash does not have an optical trigger (many/most studio flash units have one) then yes, you would need a third PW. If the flash you use has an optical trigger, and it can "see" the flash from the first flash then you don't need one.
My studio flashes all have optical triggers, but since I use softboxes with grids, barn doors, snoots, etc. to control and limit the light from a flash, in a great many cases the optical triggers don't work for me. The PW's always work.
Also, in case you don't know about it, Sekonic has PW-compatible radio modules for many of their flash meters, and that's something I use all the time. It makes it really easy to measure the light and set the flashes (I work mostly in fully manual modes).
Hope this helps...
Eldor
Montreal
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