49-370-INK 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=500mm VIS-NIR 400-1000nm

The 49-370-INK is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens, with a diameter of 25 mm, is designed for use in the visible to near-infrared spectrum, spanning from 400 to 1000nm. The lens is specifically engineered to minimize chromatic aberration, ensuring clear, focused images across the entire spectrum of operation.

The lens features a focal length of 500mm, indicated by its Effective Focal Length (EFL). This long focal length makes it suitable for applications requiring high magnification or narrow fields of view. The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, ensuring high optical quality and durability.

The 49-370-INK lens is coated with Edmund Optics' VIS-NIR0SP2002000 coating on both the front and back surfaces. This anti-reflection coating is designed to reduce surface reflections and increase transmission, thereby enhancing the overall performance of the lens.

The lens geometry is characterized by its edge thickness of 5.13mm, and its center thickness of 3mm and 2.5mm (indicated as thickness center and thickness center a respectively). The lens also features three radii of curvature (r1, r2, and r3) that contribute to its overall optical performance.