Professional Pocket Folding Magnifiers

A common question on why some hand held loupes are twice the price of standard ones. The answer is the optical quality. Better quality ones have triplet lenses which correct aberations and give  clear picture to the edge of the field of view and are frequently multi coated adding light transmission. Doublet lens magnifiers are good but inferior to triplet lenses. Give single lens high power magnifier a miss unless your budget is very tight