68-255 25mm Dia. Germanium Infrared Aspheric Lens; EFL=30mm; NA=0.42 BBAR 8-12µm

This is a high-quality aspheric lens from Edmund Optics, specifically designed for infrared applications with a wavelength of 4000nm. The lens, catalog number 68-255, boasts a base shape of a circle and is made of germanium burnett material, ensuring excellent performance in the infrared spectrum.

The lens has a diameter of 25mm and an effective focal length (EFL) of 30mm, making it suitable for a wide range of optical systems. The lens features a high numerical aperture (NA) of 0.42, which allows for a greater light-gathering capability and improved resolution.

The lens is coated with BBAR 8-12µm, ensuring high transmission and low reflection in the infrared region. The front and back of the lens are coated with "edm arcedgermanium81", further enhancing its performance in infrared applications.

The geometry of the lens includes an inner radius of 0mm, an outer radius of 0mm, a thickness at the edge of 2.29mm, and a thickness at the center of 3.25mm. The front and back faces of the lens are aspheric, with radii of curvature of 29.46mm and 40mm, respectively.

The lens is available for purchase directly from the Edmund Optics website, and the link provided indicates that it is currently in stock. This makes it an ideal choice for users who need a reliable and high-performing infrared aspheric lens for their optical systems.