49-377 30 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=200mm VIS-NIR 400-1000nm

The 49-377 is a high-quality achromatic doublet lens, boasting a 30 mm diameter and an effective focal length of 200mm, 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 purchase on their official website.

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 exceptional homogeneity, while the N-SF5, a fluorite crown glass, offers a high Abbe number and excellent transmittance in the near-infrared region.

The lens geometry is meticulously designed, with an inner radius of 0 and an outer radius of 0, providing a clean, seamless optical surface. The thickness at the edge is 6.15mm, while the center thickness is 5mm, ensuring robustness and structural integrity. The lens also features a minor radius (r1) of 123.77mm and major radius (r2) of -89.22mm, contributing to its achromatic properties.

The lens is coated with the EDM VIS-NIR 0SP2002000 coating on both the front and back surfaces, enhancing its performance in the visible to near-infrared spectrum. This coating reduces surface reflections, improves transmittance, and increases the overall efficiency of the lens.