A triplet lens, as the name shown, is a compound lens consisting of three single lenses. Normally we have two ways to understanding this terms, one as three lens system placed in position, one as cemented three pieces lens. Here what we metioned triplet lens is the second type, means three optical lens cemented together and used in the optical system as one elements, which to get fewer air interfaces. PHYO OPTICS supply the glued lens with high quality optical glue and UV curing facilities to make sure the element's optical property. Coating still available.