Quote Originally Posted by AgX View Post
As a cheaper alternative to a focusing loupe one could use a groundglass viewer. A simple device made out of a frame, a mirror and groundglas.
It yields the same image as seen on the baseboard, but is brighter and and more comfortable to view due to ist angled groundglass.
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.