Fine Cementing: At SDO, we offer Doublet Lens, Triplet Lens, Lens & Prism Assembly, Cemented Prism Cubes, using capabilities such as, UV cement & epoxy cement Centering and light path deflection checking 10K-class clean-room & laminar-flow bench ensure dust-free Fine-curing technology & skill ensure lower deformation & high adhesiveness Programable temperature & humidity tests for all cemented products Edge Blackening: We also offer highly-precise edge blackening or painting using variety of inks and paints, including silk-screening, achieving dimensional tolerance up to +/-0.05mm.