AC508-750-B 50.8 mm Dia. N-BAF10/N-SF10 Unmounted Achromatic Doublet; EFL=750mm 650-1050nm

The AC508-750-B is a high-quality achromatic doublet lens, designed and manufactured by Thorlabs. This lens, with a diameter of 50.8 mm, is part of Thorlabs' extensive catalog of optical elements, sourced from various vendors worldwide. The lens is specifically designed for use in the 650-1050nm spectral range, making it suitable for a wide range of applications in the near-infrared region.

The lens features a focal length of 750mm, indicated by the 'EFL=750mm' in its name. This long focal length makes it ideal for use in applications that require high magnification or narrow fields of view. The lens is constructed from two types of glass, N-BAF10 and N-SF10, both from Schott, which are renowned for their optical quality.

The lens is coated with Thorlabs' AC650-1050-B coating on both the front and back surfaces. This anti-reflection coating is specifically designed for the 650-1050nm spectral range, reducing surface reflections and increasing transmission. The coating also provides protection against environmental contaminants and wear, ensuring the lens maintains its performance over time.

The lens has a multiplet geometry, with three radii of curvature (r1, r2, and r3) and three thicknesses (thickness edge, thickness center 1, and thickness center 2). This complex geometry allows for the correction of chromatic aberrations, ensuring the lens delivers high-quality, distortion-free images.