22-992 15mm Dia. N-SF6 Precision Aspheric Lens; EFL=18.75mm; NA=0.4 VIS-EXT Plus 350-700nm

The 22-992 is a high-precision aspheric lens offered by Edmund Optics, boasting a 15mm diameter and a numerical aperture (NA) of 0.4. 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-SF6 Schott, a high-refractive index glass that allows for superior optical performance. The aspheric design of the lens helps to minimize spherical aberration, a common issue in traditional spherical lenses, thereby improving image quality and resolution.

The geometry of the lens includes an inner radius of 0mm, an outer radius of 0mm, a thickness at the edge of 6.1mm, and an effective focal length (EFL) of 18.75mm. The lens's front surface has a radius of curvature (R1) of 15.097mm, while the back surface (R2) is flat. The back focal length (BFL) is 14.32mm, and the thickness at the center of the lens is 8mm.

The lens features a high-quality coating, both on the front and back surfaces, denoted as 'edm visplus 35070030'. This coating is designed to enhance the lens's performance within the specified wavelength range, further contributing to the lens's overall optical quality.