68-235 25mm Dia. Germanium Infrared Aspheric Lens; EFL=12.5mm; NA=1 Uncoated
- Type
- Lens
- Subtype
- Aspheric Lens
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 12.5 mm
- BFL
- 11.61 mm
- R1
- 41.4 mm
- R2
- 435.19 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
68-235 25mm Dia. Germanium Infrared Aspheric Lens; EFL=12.5mm; NA=1 Uncoated
This is the 68-235 model from Edmund Optics, a 25mm diameter germanium aspheric lens with an effective focal length of 12.5mm. The lens is uncoated, which means it does not have any additional layers to protect or enhance its performance.
The lens's base shape is circular, and it is made of germanium burnett, a material known for its excellent transmission properties in the infrared region of the spectrum. The lens's geometry includes an inner radius of 0, an outer radius of 0, a thickness at the edge of 2.5mm, and a thickness at the center of 4.24mm.
The lens's geometry also includes a back focal length of 11.61mm and a numerical aperture of 1. The aspheric shape of the lens is defined by its radii of curvature r1 and r2, which are 41.397 and 435.187, respectively.
The lens's geometry also includes coefficients k1 and k2, both of which are 0, indicating the absence of spherical aberration. The lens's front surface has a conic constant of 0, indicating a spherical shape.
The lens is in stock and available for purchase at the vendor's website. For more information, please refer to the provided weblink.
