68-239 25mm Dia. Germanium Infrared Aspheric Lens; EFL=30mm; NA=0.42 Uncoated
- Type
- Lens
- Subtype
- Aspheric Lens
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 30 mm
- BFL
- 27.52 mm
- R1
- 29.46 mm
- R2
- 40 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
68-239 25mm Dia. Germanium Infrared Aspheric Lens; EFL=30mm; NA=0.42 Uncoated
The 68-239 is a 25mm diameter germanium aspheric lens with an effective focal length (EFL) of 30mm, making it suitable for infrared applications. This lens is sourced from Edmund Optics and is currently in stock, as indicated by its weblink status.
The lens features a base shape of a circle and is constructed from germanium burnett material. It has a wavelength of 4000 and a shape described as aspheric, which is designed to reduce spherical aberration and improve optical performance.
The geometry of the lens includes an inner radius of 0, an outer radius of 0, a diameter of 25mm, and a thickness edge of 2.29mm. The effective focal length (EFL) is 30mm, and the back focal length (BFL) is 27.52mm. The lens has a center thickness of 3.25mm, with a numerical aperture (NA) of 0.42.
The lens does not have any coating, as indicated in the coating parameter. However, it is uncoated, which may affect its performance in certain applications. The front diameter, curvature, and other parameters are all 0, indicating a flat surface.
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