47-665-INK 12.5 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=40mm VIS 0° 425-675nm

The 47-665-INK is a high-quality achromatic doublet lens, sourced from Edmund Optics, designed with a 12.5 mm diameter and a focal length of 40mm. This lens is specifically engineered for the visible light spectrum, covering wavelengths from 425 to 675 nanometers.

The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, ensuring excellent optical performance. The N-BK7, a borosilicate crown glass, is known for its low dispersion and high homogeneity, while the N-SF5, a dense flint glass, provides high refractive index and anomalous dispersion. This combination effectively minimizes chromatic aberration, a common issue in optical systems.

The lens features a standard anti-reflection coating, denoted as "edm vis-0 std curve" on both the front and back surfaces. This coating enhances light transmission, reduces surface reflections, and increases the overall efficiency of the optical system.

The geometry of the lens includes a thickness of 3.88mm at the edge, a central thickness of 3.73mm, and a central thickness 'a' of 1.33mm. The lens curvatures are defined by radii r1, r2, and r3, which are 24.77mm, -18.01mm, and -51.17mm, respectively. The lens is designed in a multiplet shape, which is a complex lens system made up of multiple individual lenses.

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