Next week I will be doing simple head and shoulder portrait setups for my job, using E100G film in 35mm (using my Spotmatic), one Bowens strobe in a softbox, and a large reflecting card for the fill-in. With the strobe, I have rented a flash meter, Minolta Auto IV. Given that it's a portrait setup, I will most likely use my 135mm lens, but I'll bring the 50mm as well during my tests to see which one I like best. I go for simple, simple, simple. The portraits are not creative, they are to be useful. I will place my strobe high up, around 45deg from subject, and the reflector card on the opposite side. I have time to do trial and error. I will balance key and fill light using the flash meter with flat diffusor, and test for 1-2 stops of difference between short and broad side, to see what difference works best. Once my lights are balanced, I need to figure out exposure. Does the camera-to-subject distance matter in determining exposure with flash? I know that the flash-to-subject distance matters, because of the inverse square law, but given that I'm working only with artificial light, won't the position of camera matter in my exposure calculation as well? I was thinking about just putting my flash meter with spherical diffuser in front of the subject's face, aim toward the camera, and use that reading for exposure.