AC254-500-A 25.4 mm Dia. N-BK7/SF2 Unmounted Achromatic Doublet; EFL=502.5mm 400-700nm

The AC254-500-A is a high-quality achromatic doublet lens from Thorlabs, designed to minimize chromatic aberration across the visible spectrum. This lens, with a diameter of 25.4 mm, is unmounted, providing users with the flexibility to integrate it into their custom optical systems.

The lens is composed of two elements, made from N-BK7 and SF2 Schott glass, respectively. These materials were chosen for their excellent optical properties, contributing to the lens's high performance. The lens's geometry is carefully designed, with radii of curvature of 337.3 mm, -186.8 mm, and -557.4 mm for the three surfaces, and thicknesses of 4 mm and 2 mm at the center of the first and second elements, respectively. The edge thickness of the lens is 5.6 mm.

The lens features Thorlabs' AC400-700-A coating on both the front and back surfaces, designed to enhance its transmission in the 400-700 nm spectral range. This coating helps to optimize the lens's performance in visible light applications.

The lens's effective focal length (EFL) is 502.5 mm, making it suitable for a wide range of applications that require high-performance, achromatic optics. The lens is currently in stock and available for immediate shipping, as indicated by its valid weblink status.