First of all, im not sure whether this is common practice for control of stars, but its a slightly modified version of the composting technique used for preventing burn out of bright nebulae/galaxy cores - where we are composting not the object, but the stars instead. This will prove useful for objects such as M45, Propus (Jellyfish), Alnitak (HH nebula), M42, Sadr as well as any other object that has a monster star lurking in-shot. Its good for NB as well as Broadband, but especially BB as that