ACT508-500-A 50.8 mm Dia. N-BK7/N-SF2 Unmounted Achromatic Doublet; EFL=500mm 400-700nm

The ACT508-500-A is a high-quality achromatic doublet lens, sourced from the renowned optical component manufacturer, Thorlabs. This lens, with a diameter of 50.8 mm, is designed for use in the 400-700nm spectral range, making it suitable for a wide range of applications in the visible spectrum.

The lens is a doublet, meaning it is composed of two individual lenses made from different materials to correct chromatic aberration. The materials used in this doublet are N-BK7 and N-SF2, both high-quality glasses produced by Schott. These materials are chosen for their excellent optical properties, including low dispersion and high transmission in the visible spectrum.

The lens has an effective focal length (EFL) of 500mm, which is the distance from the lens's principal point to the focal point. This long EFL makes the lens suitable for use in imaging systems where a high magnification is required.

The lens is unmounted, meaning it does not come with any housing or mounting hardware. This allows for flexibility in integration, as the lens can be mounted in a custom housing or mount to suit the specific needs of the application.

The lens is coated with Thorlabs' AC400-700-A coating, which is a broadband anti-reflection coating designed for use in the 400-700nm spectral range. This coating reduces surface reflections, improving transmission and reducing unwanted reflections and ghosting.