In the comfort of a studio, a photographer can use a snoot to concentrate light on a specific area. It's very useful for lighting the hair line, separating the model from the background and for creating hotspots.
Cut the bottom off an empty tube of crisps to allow the light from your flashgun to shoot straight through it.
Simply attach the top of the tube to the flashgun head with three strips of masking tape. It's easy as that!