16-999 25mm Dia. N-BK7 Precision Aspheric Lens; EFL=31.25mm; NA=0.4 SWIR-Plus 900-1700nm

This is the 16-999 model from Edmund Optics, a high-precision asperic lens designed for use in the shortwave infrared (SWIR) spectrum, specifically between 900 and 1700 nanometers. The lens is made from N-BK7, a high-quality borosilicate glass known for its excellent optical properties.

The lens has a diameter of 25mm and a numerical aperture (NA) of 0.4. The NA is a measure of the light-gathering ability of the lens, with a higher NA allowing for greater light collection and thus potentially better image quality. The effective focal length (EFL) of this lens is 31.25mm, which is the distance over which the lens focuses light.

The lens features an asphere design, which is a type of lens that has a curved surface that is not a portion of a sphere or a cylinder. This design allows for the correction of spherical aberration, a common optical problem where light rays from a point source are not all focused at the same point.

The lens is coated with Edmund Optics' SWIR-Plus coating, which is designed for use in the 900-1700nm range. This coating helps to reduce reflection and increase transmission, improving the overall performance of the lens.

According to the provided data, the lens is in stock and available for purchase. For more information, including pricing and detailed specifications, please refer to the provided weblink.