Your basic reflector can be a 3 in 1 lighting system.
Held In the CONCAVE position, the light becomes more concentrated – this option results in a very sculptured look, giving the image an editorial feel
Held in the CONVEX position – this option delivers a soft window light effect, giving a gentle and friendly ambience.
Held in the NEUTRAL position – this option creates a natural feel with a moderate light source, providing good tonal gradation.