AC508-500-B 50.8 mm Dia. N-LAK22/N-SF6HT Unmounted Achromatic Doublet; EFL=500mm 650-1050nm

The AC508-500-B 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 specifically designed for use within the spectral range of 650-1050nm, making it suitable for a wide array of applications within this wavelength range.

The lens features a focal length of 500mm, indicated by the 'EFL=500mm' parameter in its name. This long focal length contributes to a high level of magnification and a narrow field of view, making the lens ideal for use in imaging systems where a detailed, close-up view of the subject is required.

The lens is composed of two distinct materials, N-LAK22 and N-SF6HT, both from the reputable Schott glass catalog. These materials have been carefully selected for their optical properties, contributing to the lens's overall performance. The lens is coated with the THo AC650-1050-B coating on both the front and back surfaces, further enhancing its optical capabilities and ensuring durability.

The geometry of the lens is characterized by its diameter, thickness, and radii of curvature. The lens has a diameter of 50.8 mm, a thickness at the edge of 5.9 mm, and varying radii of curvature (r1=346.7mm, r2=-259.4mm, r3=-1132.4mm) that contribute to its focusing power. The lens also has a central thickness of 4.5 mm at its first center and 2.6 mm at its second center.