Thanks to you both. The loupe is one I bought off Eb@y years ago for $12--some sort of military surplus. The seller said it was used to view aerial surveillance photos. It appears to be somewhat corrected, but not by much, in that it has a sharper center than my other cheap meniscus lenses.
I agree that there is some magic in that glass. It doesn't work for every subject, but when it works, it works well.
Jonathan
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