68-258 25mm Dia. Germanium Infrared Aspheric Lens; EFL=75mm; NA=0.17 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 68-258, is made of germanium burnett, a material known for its excellent transmission properties in the infrared spectrum.

The lens has a diameter of 25mm and an effective focal length (EFL) of 75mm, making it suitable for a wide range of optical systems. The lens's numerical aperture (NA) is 0.17, which contributes to its light-gathering capability and resolution.

The lens features a unique aspheric design, which helps to reduce spherical aberration and distortion, common issues in traditional spherical lenses. The lens's base shape is circular, ensuring uniform illumination and reducing vignetting.

The lens is coated with EDm ARCedGermanium81 on both the front and back surfaces, providing broadband anti-reflection (BBAR) properties in the 8-12µm range. This coating enhances the lens's transmission capabilities, reduces surface reflections, and improves overall system performance.

The lens's geometry includes a center thickness of 2.8mm and an edge thickness of 2.39mm. The front and back focal lengths are 0mm and 72.3mm, respectively. The lens's shape is aspheric, and it has a clear aperture of 25mm.

According to the vendor, this lens is in stock and available for immediate shipping. For more information, including technical specifications and pricing, please refer to the provided weblink.