66-319 20 mm Dia. L-BAL35 Precision Aspheric Lens; EFL=15mm; NA=0.66 BBAR 425-675nm

The 66-319 is a high-precision aspheric lens, designed and manufactured by Edmund Optics. This lens boasts a 20 mm diameter and a numerical aperture (NA) of 0.66, making it a versatile choice for a wide range of optical applications.

The lens is made from L-BAL35, a material from Ohara's comprehensive catalog of optical glass. This material is known for its excellent optical properties, including high transparency across a broad spectrum, making it suitable for use in the visible light range, specifically at a wavelength of 587.6 nm.

The lens geometry is meticulously designed, with an inner radius of 0 mm, an outer radius of 0 mm, and a thickness at the edge of 3.05 mm. The effective focal length (EFL) is 15 mm, and the lens features a base shape that is circular. The front and back surfaces of the lens are coated with BBAR 425-675, a broadband anti-reflection coating that enhances transmission and reduces surface reflections.

The lens has a thickness at the center of 9.6 mm and a back focal length (BFL) of 9.16 mm. The aspheric surface is defined by a conic constant of -0.624987, ensuring superior image quality and reducing spherical aberration.