47-693 6.25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=25mm VIS 0° 425-675nm

The 47-693 is a high-quality achromatic doublet lens, boasting a 6.25 mm diameter and an effective focal length (EFL) of 25mm, specifically designed for the visible light spectrum ranging from 425 to 675nm. This lens is sourced from the reputable optical vendor, Edmund Optics.

The lens is constructed from two types of materials, N-BK7 and N-SF5, both from Schott, ensuring superior 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 achromatic doublets. The N-SF5, a dense flint glass, further reduces dispersion and provides superior achromatic performance.

The lens features a sophisticated geometry, with a thickness of 2.73mm at the edge, a center thickness of 2.3mm, and a central thickness 'a' of 0.9mm. The radii of curvature are R1 = 15.37mm, R2 = -11.16mm, and R3 = -32.17mm. The lens is designed in a circular shape, providing a wide field of view.

The lens is coated with the EDM VIS-0 standard curve on both the front and back surfaces. This coating enhances the lens's transmission properties and provides excellent protection against environmental factors, ensuring the longevity and durability of the lens.

The 47-693 is a multiplet lens, meaning it is composed of multiple elements. This design allows for the correction of optical aberrations, providing sharp and clear images. The lens is currently in stock and available for purchase through the Edmund Optics website.