The Galaxy Optics optical thin film coating system was specifically designed for coating telescope mirrors. The optical coatings have uniform center to edge thickness. The "ARC" process guarantees near 100% oxidation of overcoat refractory materials and extinction coefficients less than 0.01. The ARC coating process produces reflective coatings that are brilliant in their appearance and free of coloration. The coatings are exceptionally durable and well suited for use in the environments associated with observing. Galaxy Optics has fabricated and coated thousands of mirrors. When you choose us for your optical coating needs you can be sure you are getting the absolute best.