47-661-INK 12.5 mm Dia. S-BAH11/N-SF10 Achromatic Doublet; EFL=20mm VIS 0° 425-675nm

The 47-661-INK is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens, with a diameter of 12.5 mm, is designed for use in the visible light spectrum, specifically between 425 and 675 nanometers. The lens boasts an effective focal length (EFL) of 20mm, making it suitable for a wide range of optical applications.

The lens is composed of two elements, S-BAH11 from Ohara and N-SF10 from Schott, which are carefully arranged to minimize chromatic aberration, a common issue in optical systems. The lens features a standard curvature coating on both the front and back surfaces, denoted as 'edm vis-0 std curve'. This coating enhances the lens's performance by reducing surface reflections, thereby increasing transmission and improving image quality.

The lens geometry is meticulously designed, with an inner radius of 0 and an outer radius of 0, indicating a symmetrical design. The edge thickness is 4.62mm, while the center thickness is 5.25mm. The lens also has a small central thickness 'a' of 1.1mm. The radii of curvature for the three surfaces are r1=13.98mm, r2=-9.35mm, and r3=-76.14mm.

According to the vendor's website, the lens is currently in stock, indicating its availability for immediate use. The link to the vendor's website is provided for further details and purchasing information.