A loupe (/ˈluːp/ LOOP) is a simple, small magnification device used to see small details more closely. Unlike a magnifying glass, a loupe does not have an attached handle, and its focusing lens(es) are contained in an opaque cylinder or cone or fold into an enclosing housing that protects the lenses when not in use. Loupes are also called hand lenses.
Loupes are used in a number of industries, notably the jewelry trade, watchmaking, photography, printing, dentistry, education and ophthalmology. Loupes are also used in academia and life sciences, such as geology and biology. Amateur naturalists may also find a hand lens or a loupe a useful tool when looking at or identifying species. They are also used in numismatics and stamp collecting.
Three basic types of loupes exist:
Simple lenses, generally used for low-magnification designs because of high optical aberration.
Compound lenses, generally used for higher magnifications to control optical aberration.
Prismatic, multiple lenses with prisms.
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