49-366-INK 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=250mm VIS-NIR 400-1000nm

The 49-366-INK is a high-quality achromatic doublet lens, designed and manufactured by Edmund Optics. This lens, with a diameter of 25 mm, is specifically engineered for use in the visible (VIS) and near-infrared (NIR) spectrum, spanning from 400 to 1000 nm. The lens boasts an effective focal length (EFL) of 250 mm, making it suitable for a wide range of optical applications.

The lens is composed of two elements, made from N-BK7 and N-SF5 Schott glass, respectively. These materials are carefully selected to minimize chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. The achromatic design ensures that the lens focuses both visible and near-infrared light to the same point, enhancing the overall image quality.

The lens geometry is meticulously designed, with a central thickness of 5 mm and edge thickness of 6.75 mm. The lens features three radii of curvature: r1 at 160.73 mm, r2 at -105.64 mm, and r3 at -295.75 mm. These parameters contribute to the lens's excellent optical performance.

The lens is coated with Edmund Optics' VIS-NIR-0SP2002000 coating on both the front and back surfaces. This anti-reflection coating is designed to reduce surface reflections and increase transmission in the visible and near-infrared regions, further enhancing the lens's performance.