Optics & Allied Engg. Pvt. Ltd. Manufactures Front Coated Mirrors with silicon monoxide protective coating. Optics & Allied Engg. Pvt. Ltd. Is an ISO 9001-2000 certified company. These products are available in different sizes and shapes from 10mm to 500 mm. Reflectors range from 10mm to 300mm. The Dichroic Color Filters are ideal for machine vision, commonly used for color separations and contrast enhancement applications. Additive filters and Substractive filters are also used for color corrections. The dichroic filters are found in 28 color shades and they come up to 250mm in diameter with heat resistance capacities. They are widely used in the entertainment and lighting industries.