- Achromatic Lens Aspherical Condensor Lens Biconcave Singlet Biconvex Singlet Condenser Combination Mounted Biconvex Singlet Mounted Plano-Concave Fused Silica Singlet Mounted Plano-Concave Singlet Optical Window Plano-Concave Singlet Plano-Convex Singlet Positiv Meniscus Singlet