37-422 15mm Dia. N-BK7 Precision Aspheric Lens; EFL=22.5mm; NA=0.33 Uncoated

The 37-422 is a high-precision aspheric lens, 15mm in diameter, with a numerical aperture (NA) of 0.33, sourced from the reputable optical vendor, Edmund Optics. This lens is uncoated, offering a unique set of optical properties that make it suitable for specific applications.

The lens is designed with a base shape of a circle, featuring an inner radius of 0 and an outer radius of 0. The diameter of the lens is 15mm, and it has a thickness of 6.25mm at the edge. The effective focal length (EFL) of this lens is 22.5mm, making it suitable for applications that require a longer focal length.

The aspheric geometry of the lens is defined by its radius of curvature (R1) of 11.63mm and a conic constant (K1) of -0.901164. The back focal length (BFL) is 16.71mm, and the thickness at the center of the lens is 8.79mm. The lens is designed to operate at a wavelength of 587.6nm.

The lens is made from N-BK7 Schott glass, a popular choice for its high refractive index and low dispersion. This makes the lens suitable for applications that require high image quality and color correction.

The uncoated feature of this lens means that it does not have any additional layers to enhance its optical properties. This can result in a higher level of light scattering and a lower level of transmission compared to coated lenses. However, it can be advantageous in certain applications where the uncoated surface can reduce unwanted reflections.