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Multiple lens folding magnifiers are general purpose magnifiers. They typically have multiple lens which when used in combination provide various levels of magnification.
Use a multiple lens folding magnifier where flexibility of magnification over quality of image is wanted.
Each lens is designed to reproduce the best image when used by itself. As you add additional lenses to increase the magnification the glass of the lens added and the layer of air between the lenses distort the magnified image and bends each color of light passing through by a different amount.