Hey all, I recently borrowed an alien bee 400w strobe and am going to be using it for indoors shots. I'm shooting with a 210mm lens and I checked distances today, and at full power around 10ft away, I'm at 1/60 at f16-22. Will this be adequate for my film size? I've read in other sites that some people use 1000w+ strobes. Does anyone have experience using strobes with 8x10?