47-668-INK 12.5 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=60mm VIS 0° 425-675nm

The 47-668-INK is a high-quality achromatic doublet lens, sourced from the renowned optical component vendor, 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 60mm, 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 high-quality optical performance. The N-BK7, a borosilicate crown glass, is known for its excellent transmission properties and low dispersion, making it ideal for use in the visible spectrum. The N-SF5, a dense flint glass, further reduces dispersion, contributing to the lens's achromatic properties.

The 47-668-INK features a standard curve coating on both the front and back surfaces, specifically the EDM VIS-0 std curve. This coating enhances the lens's transmission properties, reducing surface reflections and improving overall light transmission.

The lens's geometry is also noteworthy. It has a thickness of 4.21mm at the edge, with an inner radius and outer radius of 0. The center thickness is 3.5mm, and the center thickness 'a' is 1.5mm. The lens's base shape is circular, and it is classified as a multiplet due to its construction from multiple glass elements.