just to see how I may be able to light my basement and I was so surprised. withthe Af500 and achiever on slave, the 330 on camera then manually fired, the result at 400 iso was F22!!!!!! white walls reflect ALOT. I guess a 640ws flash is way too much power to start with, and I'm better off with a 320 ws unit, but still the price difference doesn't seem to be worth it.
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