AC254-040-A 25.4 mm Dia. N-BK7/SF5 Unmounted Achromatic Doublet; EFL=40.1mm 400-700nm

The AC254-040-A is a high-quality achromatic doublet lens, unmounted and with a diameter of 25.4 mm, sourced from the renowned optical components manufacturer, Thorlabs. This lens is designed for use within the spectral range of 400-700nm, making it suitable for a wide array of applications within the visible light spectrum.

The lens features a sophisticated design, comprised of two distinct materials - N-BK7 and SF5, both from Schott. This combination allows for the effective correction of chromatic aberrations, ensuring high-resolution imaging and minimal distortion. The lens boasts an effective focal length (EFL) of 40.1mm, providing a generous field of view without compromising on image quality.

The geometry of the lens is meticulously crafted, with a central thickness of 10mm and edge thickness of 7.4mm. The lens curvature is defined by three radii: r1 at 23.7mm, r2 at -20.1mm, and r3 at -57.7mm. These specifications contribute to the lens's impressive light-gathering capabilities and overall optical performance.

The lens is coated with Thorlabs' proprietary anti-reflection coating, AC400-700-A, on both the front and back surfaces. This coating significantly reduces surface reflections, enhancing transmission and improving overall system efficiency.