48-688 9mm Dia. x -18mm FL; MgF2 Coated; Double-Concave Lens 400-700nm

The 48-688 is a high-quality double-concave lens, boasting a 9mm diameter and a focal length of -18mm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for immediate purchase, as indicated by its "in stock" status on the vendor's website.

The lens is crafted from the high-grade material, n-BK7 Schott, a borosilicate glass known for its excellent optical properties. This material ensures high transmission and low dispersion, making it ideal for a wide range of optical applications.

The 48-688 features a double-concave geometry, with radii of curvature of -18.86mm and 18.86mm for the front and back surfaces, respectively. This geometry results in a negative focal length, making it suitable for use in diverging optical systems. The lens has a central thickness of 1.5mm and an edge thickness of 2.45mm, providing robustness and durability.

The lens is coated with MgF2, a broadband anti-reflective coating that enhances its optical performance. This coating reduces surface reflections, improving transmission and contrast. The MgF2 coating is standard and has a specified curve, ensuring consistent performance across different lenses.

The 48-688 is designed for use in the visible spectrum, with a specified wavelength of 587.6nm. However, its broadband coating and high-grade material make it suitable for use across a wider spectral range, from 400nm to 700nm.