“Catalog 406” issued by Rolyn Optics Co. specifies a variety of off-the-shelf optics, including prisms, reticles, beamsplitters, transmission gratings, concave mirrors, optical flats, iris diaphragms, microscopes and magnifiers, simple and compound lenses, laser diode collimating lenses, sapphire and fused-silica windows, absorption and thin-film filters, and photo, enlarging, copy and projection lenses. The 136-page publication provides a reference section, which includes common optical formulas as well as data on the physical properties of common optical materials. Numerous charts, diagrams and application notes are supplied, along with an index.