47-634 25 mm Dia. S-BAH11/N-SF10 Achromatic Doublet; EFL=35mm VIS 0° 425-675nm

The 47-634 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and an effective focal length (EFL) of 35 mm, specifically designed for the visible light spectrum ranging from 425 to 675 nm. This lens is sourced from the reputable optical vendor, Edmund Optics.

The lens is meticulously crafted from two distinct materials: S-BAH11 from Ohara and N-SF10 from Schott. The S-BAH11 is a borosilicate glass known for its excellent anomalous dispersion characteristics, while N-SF10 is a dense flint glass renowned for its high refractive index. This combination effectively minimizes chromatic aberration, a common issue in optical systems.

The lens features a base shape of a circular multiplet, with a thickness of 9.47 mm at the edge and 11 mm at the center. The inner and outer radii are 0, and the lens has a central thickness of 11 mm and a thickness of 2.5 mm at the edge (a). The lens's geometry is further enhanced by its radii (r1, r2, and r3), which are 24.47 mm, -16.49 mm, and -131.65 mm, respectively.

The 47-634 lens comes with standard coatings on both the front and back surfaces. These coatings, identified as EDM VIS-0 std curve, are designed to optimize the lens's performance within the specified visible light spectrum.