16-955 20mm Dia. N-SF5 Precision Aspheric Lens; EFL=20mm; NA=0.5 VIS-EXT Plus 350-700nm

The 16-955 is a high-precision aspheric lens offered by Edmund Optics, boasting a 20mm diameter and a numerical aperture (NA) of 0.5. This lens is designed for use within the visible light spectrum, specifically between 350-700nm.

The lens is crafted from N-SF5 Schott, a high-refractive index glass that is known for its excellent optical properties. The aspheric design of the lens helps to minimize spherical aberration, a common issue in traditional spherical lenses, thereby improving the overall image quality.

The lens features an effective focal length (EFL) of 20mm, which is the distance over which the lens focuses light to form a sharp image. The large NA of 0.5 allows for a wide angle of view and high light-gathering capability, making this lens suitable for a variety of applications.

The lens is coated with Edmund Optics' VIS-EXT Plus coating, which is designed to enhance transmission in the visible spectrum. This coating also provides protection against environmental factors, ensuring the longevity and durability of the lens.

The 16-955 lens has a center thickness of 11.2mm and an edge thickness of 7.23mm, providing robustness and stability. The front and back surfaces of the lens are coated with the same VIS-EXT Plus coating, ensuring optimal performance from both sides.