49-281 40 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=400mm VIS 0° 425-675nm

The 49-281 is a high-quality achromatic doublet lens, boasting a 40 mm diameter and an effective focal length (EFL) of 400mm, specifically designed for the visible light spectrum ranging from 425 to 675nm. This lens is sourced from the reputable optical vendor, Edmund Optics.

The lens is constructed from two types of glass: N-BK7 from Schott and N-SF5 from Schott. These materials are carefully selected to minimize chromatic aberration, a common issue in lenses where different wavelengths of light are focused at different points. By combining these materials, the 49-281 achieves superior image quality with minimal distortion.

The lens features a multiplet geometry, which is a complex shape involving multiple radii and thicknesses. The inner radius is 0mm, while the outer radius is also 0mm. The edge thickness measures 11.3mm, and the center thickness is 8.5mm. The lens also has a center thickness 'a' of 4mm.

The 49-281 is coated with Edmund Optics' standard Vis-0 coating on both the front and back surfaces. This coating is specifically designed to optimize performance in the visible light spectrum, further enhancing the lens's image quality.

The lens is currently in stock and can be purchased directly from the Edmund Optics website using the provided weblink. With its superior design and high-quality materials, the 49-281 is an excellent choice for a wide range of optical applications.