39-470 12.7mm Dia. ZnSe Aspheric Lens; EFL=12.7mm; NA=0.5 Uncoated

The 39-470 is a high-quality aspheric lens offered by Edmund Optics, boasting a 12.7mm diameter and a focal length of 12.7mm. This uncoated lens is made of ZnSe (Zinc Selenide), a material known for its excellent transmission properties in the infrared spectrum, making it ideal for applications in this range, such as thermal imaging and night vision systems.

The lens's aspheric design allows for superior optical performance compared to traditional spherical lenses. Aspheric lenses can correct spherical aberration, a common issue in optical systems, resulting in sharper images with higher contrast and resolution. The lens's NA (Numerical Aperture) is 0.5, indicating a wide acceptance angle and high light-gathering capability.

The geometry of the lens includes an inner radius of 0mm, an outer radius of 0mm, a thickness at the edge of 2.39mm, and a thickness at the center of 3.5mm. The effective focal length (EFL) is 11.25mm, and the back focal length (BFL) is also 11.25mm. The lens's shape is defined by its radii of curvature (R1 and R2), which are 17.818mm and 0mm, respectively.

Please note that the lens does not come with any coating, as indicated in the item data. Coatings can be applied to enhance the lens's performance, such as improving its transmission, reducing reflection, or protecting it from environmental factors. However, this particular lens is uncoated, which may be suitable for certain applications where coating is not required or desirable.