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The need for good optical quality applies to loupes as well as microscopes. An optically good low powered triplet loupe with low distortion and coated lenses is not inexpensive. There are loupes and...

A loupe is an aid to honing and trick to using one is to know what you are looking at and for. In post #2 the link should give you a good idea what you are looking at and for. You then have to figure...