21-913 25mm Dia. UVFS Aspheric Lens; EFL=25mm; NA=0.48 UV-VIS 250-700nm

The 21-913 25mm Dia. UVFS Aspheric Lens is a high-quality optical component sourced from Edmund Optics. This lens, with a catalog number of 21-913, is designed for use in the ultraviolet to visible spectrum, specifically at a wavelength of 285nm.

The lens is made from syn hpfs7980 corning, a material known for its excellent optical properties. It features a circular base shape and a 25mm diameter, making it suitable for a wide range of applications. The lens has a high numerical aperture (NA) of 0.48, which allows for a wide angle of acceptance and increased light-gathering capability.

The lens's geometry includes an inner radius of 0, an outer radius of 0, a thickness at the edge of 4.7mm, and an effective focal length (EFL) of 25mm. The aspheric design of the lens, with a first radius of curvature (r1) of 12.31200037132993 and a conic constant (k1) of -0.82, helps to minimize spherical aberration and distortion, resulting in superior image quality.

The lens is coated with edm uv-vis std curve on both the front and back surfaces, which enhances its transmission characteristics in the UV-VIS range of 250-700nm. The front surface has an extremely small eccentricity (e) of 1.878008e-05, a flatness (f) of 3.222988e-08, and a surface irregularity (g) of 4.693204e-11, indicating a high degree of planarity and precision.