Long ago, before digital camera's with viewers, these were used to shoot candids. Many people start behaving unnaturally when you point a lens at them. (Don't shoot! Don't shoot!) With thispiece of equipment, you can shoot them without them noticing you as you point to somewhere else.
( Word goes that these were also used by dirty old men in raincoats on beaches where women wore...bikini's so that you could get a shot of their bellybuttons. But that has never been proven. )

There are no Borg. All resistance is fertile.