49-287-INK 50 mm Dia. N-BAK4/N-SF10 Achromatic Doublet; EFL=250mm VIS 0° 425-675nm

The 49-287-INK is a high-quality achromatic doublet lens, boasting a 50 mm diameter and an effective focal length (EFL) of 250 mm, specifically designed for the visible light spectrum ranging from 425 to 675 nm. This lens is sourced from the reputable optical vendor, Edmund Optics, and is available for purchase through their official website.

The lens is constructed from two types of Schott glass: N-BAK4 and N-SF10. 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. By combining these materials, the 49-287-INK achieves superior color correction, making it an ideal choice for a wide range of applications.

The lens geometry is meticulously designed, with an inner radius of 0 mm and an outer radius of 0 mm. The edge thickness measures 10.54 mm, while the center thickness is 9.75 mm. The lens also features a central thickness 'a' of 3.5 mm. The curvature of the lens surfaces is defined by radii of 162.59 mm and -123.82 mm for the first and second surfaces, respectively, and -402.58 mm for the third surface.

The lens is coated with the EDM VIS-0 standard curve on both the front and back surfaces. This coating enhances the lens's performance by reducing reflection and improving transmission, thereby increasing the overall efficiency and quality of the optical system.