87-981 10mm Dia. UVFS Aspheric Lens; EFL=8mm; NA=0.63 UV-VIS 250-700nm

The 87-981 is a high-performance aspheric lens, designed and manufactured by Edmund Optics. This lens, with a diameter of 10mm, is constructed from UV-grade fused silica, ensuring durability and resistance to environmental factors. The lens's design includes a high numerical aperture (NA) of 0.63, which allows for a wide angle of incidence and increased light-gathering capability.

The lens's effective focal length (EFL) is 8mm, making it suitable for applications requiring a short focal length. The lens's geometry is defined by its inner and outer radii, both of which are 0 in this case, indicating a flat surface. The lens's thickness at the edge is 3.05mm, while its center thickness is 8mm.

The 87-981 lens features a UV-VIS coating, which is standard for Edmund Optics. This coating, applied to both the front and back surfaces, enhances the lens's transmission in the UV and visible spectrum (250-700nm). The coating is designed to reduce surface reflections, thereby increasing the lens's overall efficiency.

The lens's shape is aspheric, which means it has a non-spherical surface. This design helps to reduce spherical aberration, a common optical issue that can degrade image quality. The aspheric surface is defined by its conic constant (k1) of -0.6304671 and its aspheric coefficient (r2) of 0.