10X 30X Loupes Jewelers Folding Eye Magnifying Tool 4Pc 30X Triplet Round Eye Loupe. This is a new doublet lens loupe made of optical glass with a round swing-away chrome plated case. The shape allows it to rest comfortably in the eye socket. This has become the standard style of loupe used in the watch making industry and is excellent for any application where magnification is needed. In terms of performance, it is second to none. It is 30X power and has a focal distance of 1/2" (13 mm). The lens has a 21 mm diameter. Three 10X Round Loupes. This is a new set of three 10X round loupes. Great for viewing stamps, coins, beads and gems. May help reduce eye strain. The swing away cases protects the lenses. The viewing lenses each measure approximately 16 mm (5/8") in diameter. Each has a 1" (25.5 mm) focal distance. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.