I was looking for some information regarding a flash unit that could deliver about f45 or f64 around 10 feet. I'm currently shooting plus x 125 speed film - I would consider pretty much any other film too. I'm shooting this old timey 50s prom with an 8x10, I just need a frontal flash to give the look while retaining the focus. I attached an example of the kind of image I'm going for, however the final photos will be done in a high school gym, so I'd like to have more party decorations and such in focus. I'm using reflective decorations and clothes to help with the lack of light towards the back of the frame. I'm guessing a monolight would do the trick, I was able to get f 11 with my vivitar 285hv at full power.