I would like to use my F100/SB-28 for portrait photography when there isn’t enough natural lighting... I have seen umbrella stands with flash units attached (either facing away from subject as a reflector or facing towards the subject as a diffuser)
#1. "RE: SB-28 for portraits" In response to Reply # 0
Check out this link. It's the best intro to umbrellas I believe there is anywhere. As far as portrait specifics, there are some standard setups. A high, centered light is called a beauty light. Off to the side and level, and dark background, is Rembrandt. The best all around for most of us non-experts is in front, above eye level, and off-center. In other words, you and the camera in front of the subject, and the umbrella off to your side.