16-972 12.5mm Dia. N-SF6 Precision Aspheric Lens; EFL=12.5mm; NA=0.5 NIR-Plus 600-1050nm

The 16-972 is a high-precision aspheric lens offered by Edmund Optics, designed for use in the near-infrared spectrum, specifically between 600 and 1050nm. This lens, with a diameter of 12.5mm, is made from N-SF6 Schott glass, a material known for its excellent optical properties and durability.

The lens boasts a numerical aperture (NA) of 0.5, which is a measure of its light-gathering ability. A higher NA allows for a greater amount of light to be collected, making this lens ideal for applications that require high light transmission. The effective focal length (EFL) of this lens is 12.5mm, which is the distance over which the lens focuses light. This EFL, combined with the lens's diameter, makes it suitable for use in compact optical systems.

The lens's geometry is also noteworthy. It has an inner radius of 0mm, an outer radius of 0mm, and a thickness at the edge of 5.5mm. The thickness at the center is 7.5mm, and the back focal length (BFL) is 8.34mm. The lens's aspheric shape, defined by its radii (r1 and r2) and conic constants (k1), helps to minimize spherical aberration, a common issue in optical systems.

The lens is coated with Edmund Optics' NIR-Plus 600-1050nm coating on both the front and back surfaces. This coating is designed to enhance the lens's performance in the near-infrared spectrum, reducing reflection and increasing transmission.