49-369-INK 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=400mm VIS-NIR 400-1000nm

The 49-369-INK is a high-quality achromatic doublet lens, designed and manufactured by Edmund Optics. This lens, with a diameter of 25 mm, is specifically engineered for use in the visible (VIS) and near-infrared (NIR) spectrum, spanning from 400 to 1000nm. The achromatic design ensures minimal chromatic aberration, making it an ideal choice for a wide range of optical applications.

The lens features a focal length (EFL) of 400mm, which, combined with its diameter, allows for a high level of light gathering and focusing capability. The geometry of the lens includes an edge thickness of 5.03mm, an inner radius of 0mm, and an outer radius of 0mm. The first radius of curvature (r1) is 244.65mm, while the second (r2) is -179.62mm, and the third (r3) is -534.1mm. The center thickness is 3mm, with a center thickness 'a' of 2.5mm.

The 49-369-INK is composed of two types of glass: N-BK7 from Schott and N-SF5 from Schott. These materials were chosen for their excellent optical properties and ability to minimize chromatic aberration. The lens is coated with EDm VISNIR0SP2002000 on both the front and back surfaces, enhancing its transmission capabilities and overall performance in the VIS-NIR spectrum.

This lens is available for purchase directly from the Edmund Optics website, and the link provided in the item data indicates that it is currently in stock. With its high-quality construction, precise geometry, and broad spectral range, the 49-369-INK is a versatile and reliable choice for a variety of optical systems and applications.