I have the D70s. I want to use a single Vivitar 283 off camera in a softbox, on location. Will the integral flash on the camera fire the 283, if I have a peanut slave attached? I seem to recall that there was some issue about ambient light overwhelming the slave? Will be shooting around sundown. Apart from the camera's own sync limitation, what problems will I encounter? ......probably I will shoot 1/30-1/8th am guessing.