49-364 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=200mm VIS-NIR 400-1000nm

This is the 49-364 Achromatic Doublet lens, a high-quality optical component designed for use in the visible (VIS) and near-infrared (NIR) spectrum, specifically catering to the wavelength range of 400-1000nm. The lens is sourced from the reputable vendor, Edmund Optics, and is available for purchase through their website.

The lens is a multiplet, meaning it is composed of multiple optical elements. In this case, it is made up of two different materials: N-BK7 and N-SF5, both from Schott. The N-BK7 is a well-known borosilicate crown glass, while N-SF5 is a fluorite crown glass, both offering excellent optical performance.

The lens has a diameter of 25mm and an effective focal length (EFL) of 200mm. The edge thickness of the lens is 11.56mm, while the center thickness is 8.5mm. The lens also features a coating on both the front and back surfaces, specifically the edm visnir0sp2002000 coating, which is designed to enhance its performance in the VIS-NIR spectrum.

The curvature of the lens is also noteworthy, with radii of curvature at 124.12mm, -87.26mm, and -253.1mm for the first, second, and third surfaces, respectively. The lens is designed to correct chromatic aberration, making it suitable for a wide range of applications where high-quality imaging is required.