I use parts of old lenses for loupes. The front sections of an 80-200 or thereabouts is great for contact sheets. The rear end of the same or of a telephoto like a 135 works well for looking at the ground glass. I "made" those loupes long ago from broken lenses when good loupes were really expensive. These days I'd probably just buy something simple like the Peak linked to above.
My eyes are pretty bad though, so all I have to do to focus on the ground glass is look over my glasses. My eyes naturally focus to about 5 or 6 inches. Kinda stinks to have bad eyes, but it is nice when shooting large format. Lemons/Lemonade I guess.
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