Umbrella Fill Patterns

Now that we've all got our light stands and umbrellas we need to find the optimum flash zoom length and umbrella/flash distance that will fill the umbrella without any spill over. Spill over is the flash light that is at such a wide angle that it extends past the edge of the umbrella. This light is wasted and can cause unwanted reflected/bounced fill in you images. So we need to completely fill the umbrella so we have the largest light source possible and yet keep the spill over at the minimum.