69-859 12.5 mm Dia. L-BAL35 Precision Aspheric Lens; EFL=12.5mm; NA=0.5 BBAR 425-675nm

This is a high-precision aspheric lens, catalog number 69-859, offered by Edmund Optics. The lens is designed with a base shape of a circle and is constructed from L-BAL35 material, a type of optical glass from Ohara. The lens has a diameter of 12.5 mm and a thickness of 2.11 mm at the edge, with an effective focal length (EFL) of 12.5 mm, providing a high level of optical performance.

The lens's numerical aperture (NA) is 0.5, which is a measure of the light-gathering ability of the lens. A higher NA allows for a shallower depth of field and a higher resolution, making this lens suitable for applications that require high precision and resolution.

The lens features a BBAR coating (Broadband Anti-Reflection) on both the front and back surfaces, designed to reduce reflection and increase transmission in the spectral range of 425-675 nm. This coating enhances the lens's performance in visible light applications.

The lens's geometry includes an inner radius of 0 mm, an outer radius of 0 mm, a thickness at the center of 5 mm, and a back focal length (BFL) of 9.35 mm. The lens's front surface has a conic constant of -1.058074, which contributes to its high optical performance.

The lens is currently in stock and can be purchased directly from the Edmund Optics website. With its high precision, excellent optical performance, and broadband anti-reflection coating, this lens is an excellent choice for a wide range of applications in the visible light spectrum.