16-285 25mm Dia. N-BK7 NIR Aspheric Lens; EFL=50mm; NA=0.25 NIR-Plus 600-1050nm

The 16-285 is a high-quality aspheric lens, designed for use in the near-infrared (NIR) spectrum, specifically between 600 and 1050nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and boasts a catalog number of 16-285. It is constructed from N-BK7 Schott glass, a material well-known for its excellent optical properties and versatility.

The lens features a 25mm diameter and a numerical aperture (NA) of 0.25, making it suitable for a wide range of optical applications. The effective focal length (EFL) of this lens is 50mm, which, combined with its NA, provides a decent field of view and depth of field. The lens has a center thickness of 6mm and an edge thickness of 2.86mm, contributing to its robustness and durability.

The 16-285 lens is coated with Edmund Optics' proprietary NIR-Plus coating, which is designed to enhance performance in the NIR spectrum. This coating, applied to both the front and back surfaces of the lens, reduces unwanted reflections and increases transmission, thereby improving overall image quality.

The lens's geometry is defined by its inner and outer radii, both of which are 0 in this case. The aspheric design of the lens helps correct spherical aberration, a common issue in traditional spherical lenses, thereby improving the focus and sharpness of the image.