16-957 25mm Dia. N-BK7 Precision Aspheric Lens; EFL=50mm; NA=0.25 VIS-EXT Plus 350-700nm

The 16-957 is a high-precision asperic lens offered by Edmund Optics, boasting a 25mm diameter and a numerical aperture of 0.25. This lens is designed for use within the visible light spectrum, specifically between 350-700nm, making it suitable for a wide range of optical applications.

The lens is constructed from N-BK7, a popular borosilicate glass known for its excellent optical properties. This material ensures high transmission and low auto-fluorescence, making it ideal for applications that require high image quality and low background noise.

The asperic design of this lens offers superior optical performance compared to traditional spherical lenses. The unique curvature of the lens minimizes spherical aberration, coma, and other optical distortions, resulting in sharper images with higher contrast and resolution.

The lens features an effective focal length (EFL) of 50mm, providing a moderate magnification suitable for many applications. The lens thickness at the edge is 4.14mm, while the center thickness is 7.24mm, providing structural rigidity and minimizing potential distortions caused by external forces.

The lens is coated with Edmund Optics' VIS-EXT Plus coating, which is specifically designed for the 350-700nm spectrum. This coating enhances the lens's light transmission, reduces surface reflections, and protects the lens from environmental hazards, ensuring longevity and maintaining optimal performance.