We manufacture optical flats in just about any size, shape and material. Send us a detailed drawing (pdf)
of what you need and we will provide you with a quotation.

We also manufacture larger elliptical diagonal mirrors as used in astro-imaging telescopes and large Newtonian/Dobsonian telescopes. Price and delivery time is upon request, please specify substrate material, thickness, minor axis and coating. We do not sell diagonal mirrors smaller than 4.5” minor.

Testing throughout is done by non-contacting interferometry. Flats are tested at full aperture.

For telescope diagonal mirrors may I recommend AstroSystems


Precision Flat Polishing

Testing Small Flats


4.0” – Before refigure, removed from a 16” telescope

4.0” – After Ostahowski Optics refigure