47-740-INK 40 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=160mm VIS 0° 425-675nm

The 47-740-INK is a high-quality Achromatic Doublet Lens, boasting a 40 mm diameter and an effective focal length (EFL) of 160mm, specifically designed for the visible light spectrum ranging from 425 to 675nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for immediate use.

This lens is a multiplet, meaning it is composed of multiple optical components, in this case, two, made from different materials. The first component is made from N-BK7, a well-known and widely used borosilicate crown glass, while the second component is made from N-SF5, a dense flint glass. This combination helps to correct chromatic aberration, a common issue in lenses where different wavelengths of light are focused at different points.

The lens has a thickness of 9.48mm at the edge and 8.5mm at the center, with an inner radius of 0mm and an outer radius of 0mm. The first and second radii of curvature are 98.66mm and -70.73mm, respectively, while the third radius of curvature is -205.72mm. The lens also features a central thickness of 8.5mm and an additional thickness of 4mm at the center a.

The lens is coated with EDM VIS-0 STD Curve on both the front and back surfaces, enhancing its performance in the visible light spectrum. This coating helps to reduce surface reflections, increase transmission, and protect the lens from environmental damage.