68-256 25mm Dia. Germanium Infrared Aspheric Lens; EFL=40mm; NA=0.31 BBAR 8-12µm
- Type
- Lens
- Subtype
- Aspheric Lens
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 40 mm
- BFL
- 37.89 mm
- R1
- 44.05 mm
- R2
- 65.6 mm
Material
- Name
- Germanium
- Dispersion Equation
- Sellmeier
- n (λ)
- 4.024720747638282
- λ
- 4000 nm
- B1
- 0.4886331
- C1
- 1.393959 μm2
- B2
- 14.5142535
- C2
- 0.1626427 μm2
- B3
- 0.0091224
- C3
- 752.19 μm2
68-256 25mm Dia. Germanium Infrared Aspheric Lens; EFL=40mm; NA=0.31 BBAR 8-12µm
This is a high-quality 25mm diameter germanium aspheric lens, catalog number 68-256, available from Edmund Optics. The lens is specifically designed for infrared applications, with a wavelength of 4000µm. It features a focal length of 40mm and a numerical aperture of 0.31, making it suitable for a wide range of optical systems.
The lens is made from germanium burnett, a material known for its excellent transmission properties in the infrared spectrum. The aspheric design of the lens helps to reduce spherical aberration, improving the overall image quality. The lens has a thickness of 2.38mm at the edge and 3.1mm at the center, providing robustness and durability.
The lens is coated with BBAR 8-12µm, a broadband anti-reflection coating that enhances transmission and reduces surface reflections. This coating is applied to both the front and back surfaces of the lens, ensuring optimal performance.
The lens is currently in stock and can be purchased directly from the Edmund Optics website. The provided weblink leads directly to the product page for easy access.
