49-116 25 mm Dia. L-BAL35 Precision Aspheric Lens; EFL=37.5mm; NA=0.33 BBAR 600-1050nm

The 49-116 is a high-precision aspheric lens, designed and manufactured by Edmund Optics. This lens is characterized by its 25 mm diameter and a numerical aperture (NA) of 0.33, making it suitable for a wide range of optical applications. The lens is made from L-BAL35, a material from Ohara, which is known for its excellent optical properties.

The lens has an effective focal length (EFL) of 37.5mm, which is the distance from the lens's principal point to the focal point when the lens is focused at infinity. This EFL makes the lens suitable for use in imaging systems where a moderate focal length is required.

The lens's geometry is also noteworthy. It has an inner radius of 0mm, an outer radius of 0mm, and a thickness at the edge of 2.3mm. The thickness at the center is 6mm, and the lens's front and back surfaces are coated with BBAR 600-1050, a coating that reduces reflection and increases transmission in the 600-1050nm wavelength range.

The lens's aspheric shape is another key feature. The aspheric surface is defined by a conic constant and a series of polynomial terms, which allows for the correction of spherical aberration and other optical aberrations. This results in improved image quality and increased design flexibility.