ACN254-040-A 25.4 mm Dia. N-BAF10/N-SF11 Unmounted Achromatic Doublet; EFL=-40.1mm 400-700nm

The ACN254-040-A is a 25.4 mm diameter achromatic doublet lens, featuring a sophisticated design that corrects for chromatic aberration, ensuring high-quality imaging across the visible spectrum (400-700nm). This lens is unmounted, providing flexibility for integration into various optical systems.

The lens is composed of two elements, N-BAF10 and N-SF11, both from Schott, a renowned manufacturer known for its high-quality optical glass. The first element, N-BAF10, has a refractive index of 1.5655 at 587.6nm and a dispersion of 58.8 nm/d. The second element, N-SF11, has a refractive index of 1.7882 at 587.6nm and a dispersion of 105.6 nm/d. This combination of materials and their specific properties contribute to the lens's excellent chromatic correction capabilities.

The lens has a focal length of -40.1mm, which is negative due to its diverging nature. This makes it suitable for use in applications where a virtual image is required, such as in telescopic systems or other complex optical arrangements.

The lens is coated with 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 in the 400-700nm range, further enhancing the lens's performance.