KBX157AR.18 50.8 mm Dia. x 125 mm FL; IR coated; Double-Convex Lens IR 1000-1550nm

This is a high-quality double-convex lens, designed and manufactured by MKS/Newport, a renowned vendor in the optical industry. The lens, identified as KBX157AR.18, features a diameter of 50.8 mm and a focal length of 125 mm, making it suitable for a wide range of optical applications.

The lens is made from n-BK7 Schott, a popular optical glass due to its excellent optical properties and versatility. It has a refractive index of 1.5168 at 589 nm, making it an ideal choice for applications that require high-quality imaging and light transmission.

The KBX157AR.18 lens features a unique coating that enhances its performance in the infrared spectrum. Both the front and back surfaces of the lens are coated with New AR-18, a broadband anti-reflective coating designed for use in the 1000-1550 nm range. This coating significantly reduces surface reflections, improving light transmission and enhancing the overall performance of the lens.

The lens geometry is another notable feature. It has an edge thickness of 3 mm and a center thickness of 8.098 mm, providing excellent structural integrity. The lens's inner and outer radii are 0, and its base shape is circular, making it compatible with various optical systems.