39-496 50.8mm Dia. ZnSe Aspheric Lens; EFL=50.8mm; NA=0.5 Uncoated

This is a high-quality 39-496 ZnSe Aspheric Lens, sourced from the renowned optical components vendor, Edmund Optics. The lens boasts a 50.8mm diameter and is designed with an effective focal length (EFL) of 50.8mm, making it ideal for a wide range of optical applications.

The lens is made from ZnSe (Zinc Selenide), a material known for its excellent transmission properties in the infrared region, specifically at 10.6µm. This makes the lens particularly suitable for applications in the field of infrared optics, such as IR spectroscopy, thermal imaging, and other similar applications.

The lens features an aspheric design, which is a type of lens that has a non-spherical surface. This design helps to reduce spherical aberration, a common optical problem where light rays fail to meet at a single point, resulting in a blurred image. The aspheric design ensures that the lens provides a clear, sharp image, even when used at wide apertures.

The lens has a numerical aperture (NA) of 0.5, which is a measure of the lens' ability to gather light. A higher NA allows for more light to be gathered, which can be beneficial in low-light conditions or when high resolution is required.

The lens is uncoated, meaning it does not have any additional layers applied to its surface to alter its optical properties. While coatings can be beneficial in reducing reflection and increasing transmission, an uncoated lens can be advantageous in certain applications where the natural properties of the lens material are desired.

The lens has a center thickness of 6.5mm and an edge thickness of 2.08mm. The front diameter of the lens is 50.8mm, and it has a back focal length (BFL) of 48.1mm.