67-274 15mm Dia. UVFS Aspheric Lens; EFL=12.5mm; NA=0.6 VIS 425-675nm

This is the 67-274 model from Edmund Optics, a 15mm diameter UV Fused Silica Aspheric Lens, specifically designed for applications within the visible light spectrum (425-675nm). The lens boasts an effective focal length of 12.5mm and a numerical aperture of 0.6, making it a high-performance option for a variety of optical systems.

The lens is made from HPFS7980 Corning, a high-purity fused silica known for its excellent transmission properties and resistance to thermal shock. The aspheric design of the lens helps to reduce spherical aberration, a common issue in traditional spherical lenses, resulting in improved image quality and resolution.

The lens features a sophisticated coating on both the front and back surfaces. This coating, referred to as the EDM Vis 425-675nm coating, is specifically designed to enhance the lens' performance within the visible light spectrum. It ensures high transmission rates, low reflectivity, and protection against environmental factors such as dust and moisture.

The geometry of the lens is also noteworthy. It has an inner radius of 0mm, an outer radius of 0mm, a thickness at the edge of 2.47mm, and a thickness at the center of 9mm. The front and back surfaces of the lens have specific curvatures (r1 and r2) and aspheric coefficients (k1), which contribute to its superior optical performance.