Optical Surfaces Ltd Optical Surfaces Ltd are a British company of craftsmen, manufacturing large, very high precision optics, including off-axis parabolas, and mounted optical systems. Learn more about Optical Surfaces Ltd » Off Axis Parabolas Conic Sections Aspheric Lenses Toroids Flats & Windows Etalons Spherical Mirrors Reflective Collimators Laser Beam Expanders Mounts and Mounted Mirrors Custom … Continue reading Optical Surfaces Ltd