49-291 50 mm Dia. N-BAF10/N-SF10 Achromatic Doublet; EFL=75mm MgF2 400-700nm

The 49-291 is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens is specifically designed for use in the 400-700nm spectral range, making it suitable for a wide range of optical applications.

The lens features a 50mm diameter and an effective focal length (EFL) of 75mm, providing a substantial working distance for your optical system. The lens is constructed from two types of Schott glass, N-BAF10 and N-SF10, which are renowned for their excellent optical properties.

The lens is coated with Edmund Optics' standard MgF2 coating on both the front and back surfaces. This coating is designed to provide high transmission across the visible spectrum, reducing unwanted reflections and improving overall system performance.

The lens geometry includes a central thickness of 20mm, with an edge thickness of 17.07mm and a center thickness 'a' of 4.5mm. The lens curvature is defined by radii of 51.88mm and -32.79mm for the first and second surfaces, respectively, and a -309.45mm radius for the third surface.

The lens is available directly from Edmund Optics, and the provided weblink indicates that it is currently in stock. This makes the 49-291 an ideal choice for users who require a high-performance achromatic doublet lens with a rapid delivery time.