New 15X Eye Loupe. This is a new doublet loupe. It is made of optical glass with a chrome plated swing-away 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. It is 15X power and the lens is 12mm in diameter. The focal distance is 3/4" (19 mm).