Accurate focus through enlarger
This is the same effect a tool marketed as the hocus focus used to great effect. It is basically a question marked shaped piece of plastic with a frosted top and within the bottom portion rested a mirror, and the bottom tip allowed you to rest and tilt it any way you'd want on the baseboard. Easy and a quick way to get focus, but I still preferred the magnified view through a grain finder.
Originally Posted by AgX