84-342 50mm Dia. UVFS Aspheric Lens; EFL=60mm; NA=0.42 UV-VIS 250-700nm

The 84-342 is a high-performance aspheric lens, designed and manufactured by Edmund Optics. This lens boasts a 50mm diameter and a numerical aperture (NA) of 0.42, making it suitable for a wide range of applications. The lens is constructed from UV-fused silica, a material known for its excellent transparency across the UV-VIS spectrum, spanning from 250 to 700nm.

The lens features a focal length of 60mm, as indicated by its effective focal length (EFL). This, coupled with its NA, allows for a wide field of view and high light-gathering capability. The lens also has a high refractive index, which contributes to its compact size and excellent imaging performance.

The 84-342's aspheric design is a significant advantage. Unlike spherical lenses, aspheric lenses can correct spherical aberration, a common issue in optical systems. This results in improved image quality, particularly at the lens' edges. The lens' geometry includes a large inner radius, a small outer radius, and a thickness of 4.42mm at the edge, which contribute to its superior optical performance.

The lens is coated with Edmund Optics' standard UV-VIS coating on both the front and back surfaces. This coating enhances the lens' transmission and reduces surface reflections, further improving its imaging performance. The coating is designed to be compatible with the lens' UV-VIS transparency range.