I have 2 Bowens gemini heads and a white vinyl backdrop, I want to overexpose the backdrop compared to the subjects. I already have a Canon EX420 flash and wonder if I purchased another flash say a EX430 or similar could I use these on tripods to aim at the backdrop to overexpose it by 1 or 2 stops?
Also what type of trigger would I need to fire them as slaves to the Bowens?
I have a radio trigger for the bowens but the EX420 is an infra red trigger as far as I know as I have never fired it off camera.
Will triggers as below be ok to trigger speedlights to over expose the backdrop?
Thanks for any advice