LOUPE 10 x 21 mm Triplet
These pocket magnifiers feature quality polished glass Triplet Lenses in a polished metal housing. Three element 10 power 21 mm jewelers loupe in a polished metal housing
Triplet Lens Design:
A triplet lens is an optical device consisting of three single lenses. The triplet design is the simplest to give the required number of degrees of freedom to allow the lens designer to overcome all Seidel aberrations. Aberration leads to blurring of the image produced by an image-forming optical system.