49-351 20 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=60mm VIS-NIR 400-1000nm

The 49-351 is a high-quality achromatic doublet lens, designed and manufactured by Edmund Optics. This lens is specifically engineered for use in the visible (VIS) and near-infrared (NIR) spectrum, with a wavelength range of 400-1000nm. The lens boasts a 20mm diameter and a focal length of 60mm, making it a versatile choice for a wide range of optical applications.

The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott. This combination is used to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. The use of these materials ensures that the lens provides sharp, clear images across the entire spectrum it is designed to handle.

The 49-351 lens features a sophisticated geometry, with a central thickness of 5mm and edge thickness of 4.98mm. The radii of the lens surfaces are R1 = 35.92mm and R2 = -28.12mm, R3 = -83.79mm, which contribute to its excellent optical performance. The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000) on both the front and back surfaces, further enhancing its performance in the specified wavelength range.

In terms of availability, the 49-351 lens is currently in stock, according to the Edmund Optics website. The lens is part of their extensive catalog, which includes a wide variety of optical elements from different vendors worldwide. This lens, with its high-quality materials, advanced design, and reliable performance, is an excellent choice for researchers and engineers in various fields, including physics, engineering, and biology.