45-422 25 mm Dia. N-BK7/N-SF5 Negative Achromatic Doublet; EFL=-75mm MgF2 400-700nm

The 45-422 is a high-quality negative achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens, with a diameter of 25 mm, is designed for use in the visible spectrum, specifically optimized for the 400-700nm range.

The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, ensuring superior optical performance. The use of these materials in a doublet configuration helps to correct chromatic aberration, a common issue in optical systems, making this lens an excellent choice for a wide range of applications.

The lens features an effective focal length (EFL) of -75mm, indicating its negative meniscus shape. This shape is ideal for use in beam expanding or collimating applications. The lens has a center thickness of 2.5mm, with a slightly thicker edge at 8.9mm, providing structural rigidity while minimizing optical distortion.

The lens surfaces are coated with Edmund Optics' standard MgF2 coating, designed for the 400-700nm spectrum. This coating enhances the lens's light transmission capabilities, reduces surface reflections, and increases overall system efficiency.

The 45-422 is currently in stock and available for immediate purchase through the Edmund Optics website, as indicated by its valid weblink status. This lens is a versatile and reliable choice for any optical system requiring a high-performance, negative achromatic doublet lens.