Originally Posted by
jim10219
I use a cheap thread counter. It works so well, I can't imagine any advantage to using a more expensive one.
Here's my problem with a focusing loupe. Unlike a piece of film, your eyes can focus themselves. So you don't need to focus the loupe on the front of the ground glass, because your eyes can do that. And unless you keep your eye at the exact same distance every time you view through the loupe, it's focus will change too. Just like how if you raise or lower your enlarger's head, it changes the focus as well as the size of the projected image. So unlike a camera lens on film, you've got two competing and constantly changing variables. Therefore, focus just need to be within a usable range, and not precise. Maybe if my near vision was bad, I'd find a use for a focusing loupe (to help compensate for that). But with my good near vision (and terrible far vision), pretty much any magnifying glass works just as well as any other.
And my real world experience backs this up. I've never had focusing issues using the super cheap 8x thread counter. Plus I like how it folds up small, and is easily and cheaply replaced should I lose or damage it.
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