68-253 25mm Dia. Germanium Infrared Aspheric Lens; EFL=20mm; NA=0.63 BBAR 8-12µm

This is a high-quality 25mm diameter germanium aspheric lens, catalog number 68-253, available from Edmund Optics. It is specifically designed for infrared applications, with a wavelength range of 4000nm. The lens is coated with BBAR 8-12µm, ensuring optimal performance in its intended range.

The lens features an effective focal length (EFL) of 20mm, providing a compact and efficient optical solution. It has a high numerical aperture (NA) of 0.63, which allows for a wide angle of view and increased light gathering capability. The aspheric design of the lens helps to reduce spherical aberration, providing sharper images and improved overall optical performance.

The lens has a center thickness of 3.7mm and an edge thickness of 2.5mm, providing robustness and durability. The front and back surfaces of the lens are coated with edm arcedgermanium81, which enhances its transmission characteristics and protects it from environmental hazards.

The item data also provides detailed geometry information, including the inner and outer radii, diameter, thickness edge, bfl, k1, k2, na, d front, e front, f front, g front, h front, and j front. However, without additional context, these parameters may not be immediately meaningful to users. Therefore, they are provided for reference and can be used to compare this lens with other similar products.