I use my everyday reading glasses, and focus from the normal reading distance. I haven't used a loupe for focusing on the viewing screen for a number of years. But sometimes I carry one, just in case I lose the glasses. It's actually the front lens assembly from a small slide projector. Slide projector lens make excellent magnifying lenses. A spare enlarging lens may also work; ie 75mm etc. A decent loupe . . . I've never seen one of those. ;-)
Last edited by DannL; 07-05-2013 at 12:01 PM. Click to view previous post history.