47-646 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=225mm VIS 0° 425-675nm

The 47-646 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and an effective focal length (EFL) of 225mm, specifically designed for the visible light spectrum ranging from 425 to 675nm. This lens is sourced from the renowned optical components manufacturer, Edmund Optics, and is available for purchase through their official website.

The lens is constructed from two types of glass: N-BK7 from Schott and N-SF5 from Schott. These materials are carefully selected to minimize chromatic aberration, a common issue in lens systems where different wavelengths of light are focused at different points. By combining these materials, the 47-646 achieves superior image quality and color correction.

The lens geometry is meticulously designed, with a thickness of 4.67mm at the edge, a central thickness of 3mm, and a thickness of 2.5mm at the center a. The inner and outer radii are 0mm, and the lens features three distinct radii: r1 at 139.53mm, r2 at -100.21mm, and r3 at -291.32mm. These parameters contribute to the lens's overall performance and optical characteristics.

The 47-646 is coated with Edmund Optics' standard Vis-0 coating on both the front and back surfaces. This coating is specifically designed to optimize performance within the visible light spectrum, further enhancing the lens's color correction and image quality.