32-927-INK 40 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=400mm MgF2 400-700nm

The 32-927-INK is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens, with a diameter of 40 mm, is designed for use in the visible spectrum, specifically optimized for the 400-700 nm range. The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, ensuring superior optical performance.

The lens features an effective focal length (EFL) of 400 mm, making it suitable for a wide range of applications that require long focal lengths. The lens's geometry includes a thickness of 11.3 mm at the edge, 8.5 mm at the center, and 4 mm at the center with an anti-reflection coating of MgF2 on both the front and back surfaces. This coating enhances the lens's performance by reducing surface reflections, thereby increasing transmission and minimizing lens flare.

The 32-927-INK lens is a multiplet, meaning it is composed of multiple elements. The curvature of these elements is carefully designed and controlled to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. This achromatic design ensures that the lens focuses light of different wavelengths onto a single point, providing sharp, clear images.