22-711 150mm Dia. N-BK7 Precision Aspheric Lens; EFL=150mm; NA=0.5 BBAR 425-675nm

This is a high-precision aspheric lens offered by Edmund Optics, catalog number 22-711. It is designed for use in the visible spectrum, with a central wavelength of 587.6nm. The lens is made from N-BK7 glass, a popular choice for its high homogeneity and excellent optical transmission properties.

The lens has a diameter of 150mm and a numerical aperture (NA) of 0.5. The NA is a measure of the light-gathering ability of the lens and is an important factor in determining the resolution and brightness of the image formed. The lens also features broadband anti-reflection (BBAR) coating, which enhances its light transmission capabilities, particularly in the 425-675nm range.

The lens geometry is defined by several key parameters. The inner radius is 0, and the outer radius is also 0, indicating a symmetrical design. The thickness at the edge is 7.51mm, and the effective focal length (EFL) is 150mm. The lens has an aspheric surface with a radius of curvature (R1) of 77.52mm and a conic constant (K1) of -0.96.

The coating on both the front and back surfaces of the lens is BBAR 425-675nm. This coating reduces reflection and increases transmission, thereby improving the overall performance of the lens.