The ACT508-400-A is a high-quality achromatic doublet lens, unmounted and with a diameter of 50.8 mm, sourced from the renowned optical component manufacturer, Thorlabs. This lens is designed for use within the 400-700nm wavelength range, making it suitable for a wide array of applications within the visible light spectrum.
The lens features a geometry that includes an outer radius of 0mm, an inner radius of 0mm, and a thickness edge of 14.1mm. The first and second radii of curvature are r1=292.3mm and r2=-148.9mm, while the third radius of curvature is r3=-398.5mm. The lens has two centers with equal thicknesses of 8mm.
The ACT508-400-A is composed of two types of glass: N-BK7 from Schott and N-SF2 from Schott. These materials have been carefully selected to minimize chromatic aberration, a common issue in optical systems that use lenses with different refractive indices for various wavelengths.
The lens is coated with the THORLABS AC400-700-A coating on both the front and back surfaces. This anti-reflection coating is designed to reduce surface reflections and increase transmission within the 400-700nm wavelength range.