49-337-INK 15 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=50mm VIS-NIR 400-1000nm

The 49-337-INK is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens is specifically designed for use in the visible (VIS) and near-infrared (NIR) spectrum, spanning 400-1000nm. The lens boasts a 15mm diameter and an effective focal length (EFL) of 50mm, 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, ensuring superior optical performance. The N-BK7, a borosilicate crown glass, is known for its excellent homogeneity and low optical dispersion, while the N-SF5, a fluorite crown glass, offers a high Abbe number and low refractive index. This combination of materials helps to minimize chromatic aberration, a common issue in optical systems.

The 49-337-INK features a sophisticated geometry, with a central thickness of 5mm and edge thickness of 5.12mm. The lens also includes an inner radius of 0mm and an outer radius of 0mm. The first and second radii of curvature are 26.81mm and -23.82mm, respectively, while the third radius of curvature is -90.79mm. This complex geometry is designed to provide optimal performance across a wide range of applications.

The lens is coated with the EDM VIS-NIR 0SP2002000 coating on both the front and back surfaces. This anti-reflection coating is designed to reduce surface reflections and increase transmission in the VIS-NIR range, further enhancing the lens's performance.