69-854 12.5 mm Dia. N-SF5 Precision Aspheric Lens; EFL=9.5mm; NA=0.66 Uncoated

This is a high-precision aspheric lens offered by Edmund Optics, with the catalog number 69-854. The lens is designed for use with a wavelength of 587.6 nm and is made from N-SF5 Schott, a high-quality optical glass. The lens is uncoated, which means it does not have any additional layers to enhance its optical properties.

The lens has a diameter of 12.5 mm and a numerical aperture (NA) of 0.66, making it suitable for applications that require high light-gathering capabilities and high resolution. The effective focal length (EFL) of the lens is 9.5 mm, which determines the distance from the lens at which an object must be placed to achieve a focused image.

The lens geometry is also noteworthy. It has an inner radius of 0 mm and an outer radius of 0 mm, indicating that it is a symmetric lens. The thickness at the edge is 1.6 mm, and the thickness at the center is 5 mm. The lens has an aspheric surface with a conic constant of -1.186336, which helps to correct spherical aberration and improve the image quality.

The lens is available for purchase through the Edmund Optics website, and the link provided is valid and indicates that the lens is in stock. This makes it a readily available option for those in need of a high-quality aspheric lens for their optical system.