84-338 25mm Dia. UVFS Aspheric Lens; EFL=25mm; NA=0.5 UV-VIS 250-700nm

The 84-338 is a high-performance aspheric lens, designed and manufactured by Edmund Optics. This lens, with a diameter of 25mm, is constructed from UV fused silica, a material known for its excellent transparency across a wide spectrum, from 250 to 700nm. The lens features a high numerical aperture (NA) of 0.5, which allows for a greater light-gathering capability and improved resolution.

The lens's geometry is optimized for superior performance. It has an effective focal length (EFL) of 25mm, ensuring a compact and efficient optical system. The lens's inner and outer radii are 0, indicating a planar surface, which can help minimize optical aberrations. The lens's thickness at the edge is 1.75mm, while its center thickness is 9.75mm, providing structural rigidity and stability.

The 84-338 lens features an asphere with a radius of curvature (R1) of 11.462mm and a conic constant (K1) of -1.661222. This asphere helps correct spherical aberration, a common issue in traditional spherical lenses, thereby improving the image quality and resolution. The lens's back focal length (BFL) is 18.32mm, which is crucial for determining the overall length of the optical system.

The lens is coated with Edmund Optics' standard UV-VIS coating on both the front and back surfaces. This coating enhances the lens's transmission in the UV-VIS range, reduces surface reflections, and protects the lens from environmental hazards.