47-670-INK 12.5 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=80mm VIS 0° 425-675nm

The 47-670-INK is a high-quality achromatic doublet lens, sourced from the renowned optical components manufacturer, Edmund Optics. This lens, with a diameter of 12.5 mm, is designed for use in the visible light spectrum, specifically between 425 and 675 nanometers. The lens boasts an effective focal length (EFL) of 80mm, making it suitable for a wide range of optical applications.

The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, a leading manufacturer of high-quality optical glass. This combination of materials helps to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. The achromatic design ensures that the lens focuses both red and blue light to the same point, providing sharper images and improved overall system performance.

The lens features a standard curvature coating on both the front and back surfaces, denoted as 'edm vis-0 std curve'. This coating helps to reduce surface reflections, improving light transmission and enhancing the overall performance of the lens.

The lens geometry includes a thickness of 3.12mm at the edge, with the center thickness being 2.1mm. The lens also features a concave radius (r1) of -49.62mm, a convex radius (r2) of -35.73mm, and a concave radius (r3) of -103.22mm. The inner and outer radii are both zero, indicating a circular shape.