49-339-INK 18 mm Dia. N-BAF10/N-SF10 Achromatic Doublet; EFL=27mm VIS-NIR 400-1000nm

The 49-339-INK is an 18 mm diameter achromatic doublet lens, designed for use in the visible to near-infrared spectrum, spanning 400 to 1000 nanometers. This lens is sourced from Edmund Optics, a leading provider of optical components. The lens is part of their extensive catalog, available for purchase at the provided weblink, which is currently valid and indicates the product is in stock.

The lens is a multiplet, meaning it is composed of multiple optical elements. The specific elements used in this doublet are N-BAF10 and N-SF10, both from Schott, a renowned manufacturer of high-quality optical glass. These materials are carefully selected to minimize chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points.

The lens has an effective focal length (EFL) of 27mm, a key parameter in lens specification that determines the lens's magnification power. The geometry of the lens includes a thickness of 6.62mm at the edge, with the center thickness being slightly greater at 7.67mm. The lens also features inner and outer radii of 0, and has a first radius (r1) of 18.7mm and a second radius (r2) of -13.11mm. The lens also has a third radius (r3) of -119.12mm, and a thickness at the center of 7.67mm.

Both the front and back surfaces of the lens are coated with EDMM VIS-NIR 0SP2002000, a broadband anti-reflection coating designed for use in the visible and near-infrared regions. This coating helps to reduce surface reflections, improving the overall efficiency and contrast of the optical system.