I'd make sure that none of the light spilled past the edges (so you would see a rectangle illuminated in the center of the near-circle umbrella).
My guess is that you will need to use one of the widest settings to achieve this.
Mr. Bill
Tom Williams wrote:
I'm wondering if any of you use your 550EX with an umbrella? I am starting to play around with umbrella lighting by way of my 550 and a ST-E2 transmitter. I was wondering if the setting of the flash head zoom would make much of a difference seeing how the light is bouncing out of the umbrella. I have two sizes of umbrellas, a 34" and a 45". The 550 sets itself to 24mm when switched to "Slave" but I'm thinking maybe there is a difference in intensity if the head was zoomed in, with a more narrow beam at 105mm.
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