49-278-INK 5 mm Dia. N-BAF10/N-SF10 Achromatic Doublet; EFL=20mm VIS 0° 425-675nm

The 49-278-INK is a high-quality Achromatic Doublet Lens, boasting a diameter of 5 mm and an effective focal length (EFL) of 20 mm. Sourced from the renowned optical vendor Edmund Optics, this lens is designed for visible light applications, specifically within the wavelength range of 425-675 nm.

This 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 high-index glasses manufactured by Schott. 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 geometry is meticulously designed, with an inner radius of 0 mm, an outer radius of 0 mm, and a thickness at the edge of 2.38 mm. The first radius of curvature (r1) is 14.11 mm, while the second radius (r2) is -8.63 mm, and the third radius (r3) is -75.59 mm. The center thickness of the lens is 1.61 mm, and the thickness at the center aperture is 1.03 mm.

The lens features standard EDMVIS-0 coatings on both the front and back surfaces, providing excellent transmission and protection across the specified visible light spectrum. This lens is currently in stock and available for immediate purchase through the provided weblink.