More and more optical sensors and camera systems are being used in the field of color measurement. Color temperature measurement is a standard process which occurs in aircrafts, offices and public buildings. Materion Balzers Optics has developed and manufactured optical filters which protect sensors from ambient light and enhance their efficiency. Our filters offer a sharp spectral edge with a high transmittance level in the pass band area, with a blocking level of >OD5. Based on their sputter manufacturing process, our filters are robust enough to be used even under harsh environmental conditions.