49-310 6.25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=40mm VIS-NIR 400-1000nm

The 49-310 is a high-quality achromatic doublet lens, boasting a 6.25 mm diameter and a focal length of 40mm, specifically designed for the visible to near-infrared spectrum (400-1000nm). This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for immediate use.

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 low dispersion and excellent homogeneity, while the N-SF5, a fluorite crown glass, offers a high Abbe number and low refractive index. This combination effectively minimizes chromatic aberration, a common issue in lens systems.

The lens features a geometry that includes a 3.01mm edge thickness, a 2.3mm center thickness, and a 2.3mm center thickness 'a'. The inner and outer radii are 0, suggesting a simple, circular shape. The lens's design is a multiplet, indicating a complex structure that enhances its optical capabilities.

The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000), which is applied to both the front and back surfaces. This coating is specifically designed to enhance performance in the visible to near-infrared spectrum, reducing reflection and increasing transmission.