67-336 40 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=750mm VIS-NIR 400-1000nm

The 67-336 is a high-quality achromatic doublet lens, boasting a 40 mm diameter and a focal length of 750mm, specifically designed for the visible (VIS) and near-infrared (NIR) spectrum, spanning 400-1000nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is a testament to their commitment to precision and performance.

The lens is constructed from two types of Schott glass, N-BK7 and N-SF5, which are renowned for their excellent optical properties. The N-BK7, a borosilicate crown glass, is known for its low dispersion and high transmission, making it ideal for a wide range of applications. The N-SF5, a dense flint glass, further reduces dispersion, ensuring the lens delivers sharp, clear images.

The lens features a sophisticated geometry, with an inner radius of 0mm, an outer radius of 0mm, and a thickness at the edge of 7.36mm. The thickness at the center is 4mm, while the thickness at the center 'a' is also 4mm. This geometry, combined with the high-quality materials, ensures the lens provides excellent image quality and minimal chromatic aberration.

The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000), which is applied to both the front and back surfaces. This coating enhances the lens's transmission and reduces reflection, further improving image quality and ensuring the lens performs optimally in its intended spectrum.