AC254-125-A 25.4 mm Dia. N-BK7/N-SF5 Unmounted Achromatic Doublet; EFL=125mm 400-700nm

The AC254-125-A is a high-quality achromatic doublet lens, sourced from the renowned optical component manufacturer, Thorlabs. This lens, with a diameter of 25.4 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 multiplet, meaning it is composed of multiple elements. The two primary materials used in its construction are N-BK7 and N-SF5, both of which are high-grade Schott glasses known for their excellent optical properties. The use of these materials helps to minimize chromatic aberration, a common issue in lens systems, thereby ensuring high-quality imaging.

The lens has a focal length of 125mm, as indicated by its Effective Focal Length (EFL). This, combined with its diameter, allows for a wide field of view while maintaining a compact form factor. The lens also features a broadband anti-reflection coating (AR coating), specifically the tho ac400-700-a coating, on both its front and back surfaces. This coating reduces surface reflections, thereby improving transmission and minimizing loss of light.

The lens is unmounted, providing users with the flexibility to integrate it into their own optical systems. However, users should exercise caution when handling the lens to avoid damage, especially to its delicate coatings.