49-387 40 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=450mm VIS-NIR 400-1000nm

The 49-387 is a high-quality achromatic doublet lens, boasting a 40 mm diameter and a focal length of 450mm, specifically designed for the visible to near-infrared spectrum (400-1000nm). This lens is sourced from the renowned optical vendor, Edmund Optics, and is a testament to their commitment to precision and quality.

The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, a leading manufacturer of optical glass. This combination ensures superior optical performance, minimizing chromatic aberration and delivering sharp, clear images. The lens features a front and back coating of edm visnir0sp2002000, further enhancing its performance by reducing surface reflections and increasing transmission.

The geometry of the lens is carefully designed for optimal performance. It has an edge thickness of 8.94mm, an inner radius of 0mm, and an outer radius of 0mm. The first and second radii (r1 and r2) are 279.6mm and -199.51mm respectively, while the third radius (r3) is -579.39mm. The center thickness is 6mm, with the front and back surfaces having a thickness of 4mm each.

This lens is a multiplet, meaning it is composed of multiple elements. The design and construction of this multiplet ensure that it provides excellent imaging performance, making it suitable for a wide range of applications in the fields of research, industry, and education.