88-597 75 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=300mm VIS-NIR 400-1000nm

The 88-597 is a high-quality achromatic doublet lens, boasting a 75 mm diameter and a focal length of 300 mm, specifically designed for the visible (VIS) and near-infrared (NIR) spectrum of 400-1000 nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available in their catalog under the catalog number 88-597.

This lens is a multiplet, meaning it is composed of multiple optical components, in this case, two lenses made of different materials. The first material is N-BK7, a well-known borosilicate crown glass produced by Schott, while the second material is N-SF5, a high-index flint glass from the same manufacturer. The combination of these materials in a doublet configuration effectively minimizes chromatic aberration, a common issue in lens systems where different wavelengths of light are focused at different points.

The lens has a thickness of 13.97 mm at the edge and 13.59 mm at the center, with an additional 6 mm of thickness at the center due to the achromatic doublet configuration. The inner and outer radii are 0 mm, indicating that this lens has no curvature at its edges.

The 88-597 lens features a coating called "edm visnir0sp2002000" on both the front and back surfaces. This coating is designed to optimize performance in the VIS-NIR spectrum, enhancing the lens's transmission and reducing unwanted reflections.