AC127-050-A 12.7 mm Dia. N-BK7/SF2 Unmounted Achromatic Doublet; EFL=50mm 400-700nm

The AC127-050-A is a high-quality achromatic doublet lens, sourced from the renowned optical component manufacturer, Thorlabs. This lens 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 features a 12.7 mm diameter and a focal length of 50mm, as indicated by its EFL (Effective Focal Length) value. The achromatic design of the lens ensures that it effectively compensates for chromatic aberration, a common issue in lens systems where different wavelengths of light are focused at different points. This makes the AC127-050-A an ideal choice for applications that require high optical precision and color correction.

The lens is constructed from two types of glass, N-BK7 and SF2, both from Schott. N-BK7, also known as BK7, is a borosilicate glass commonly used in optical systems due to its excellent optical properties and high damage threshold. SF2, on the other hand, is a high-index flint glass that is often used in achromatic doublets to correct for chromatic aberration.

The lens is unmounted, providing users with the flexibility to integrate it into their own optical systems. It comes with anti-reflection coatings (AR) on both the front and back surfaces, specifically the THORLABS AR400-700A coating. This coating is designed to reduce surface reflections and increase transmission in the 400-700nm range, further enhancing the lens's performance.