69-141 25mm Dia. L-BAL35 Calibration Grade Aspheric Lens; EFL=18.75mm; NA=0.66 Uncoated
- Type
- Lens
- Subtype
- Aspheric Lens
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 18.75 mm
- BFL
- 12.46 mm
- R1
- 11.05 mm
- R2
Material
- Name
- L-BAL35
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5891276536746055
- λ
- 587.6 nm
- B1
- 1.1626263
- C1
- 0.0125957437 μm2
- B2
- 0.325661051
- C2
- -0.0032691105 μm2
- B3
- 1.35132486
- C3
- 119.214596 μm2
69-141 25mm Dia. L-BAL35 Calibration Grade Aspheric Lens; EFL=18.75mm; NA=0.66 Uncoated
This is the 69-141 model from Edmund Optics, a high-quality Calibration Grade Aspheric Lens with a 25mm diameter and a numerical aperture (NA) of 0.66. The lens is uncoated, which means it does not have any additional layers to protect or enhance its optical properties.
The lens is made from L-BAL35, a material from Ohara, which is known for its excellent optical properties. The lens has an effective focal length (EFL) of 18.75mm, which is the distance from the center of the lens to the point at which the light rays converge.
The lens geometry is also noteworthy. It has an inner radius of 0mm, an outer radius of 0mm, a thickness at the edge of 1.63mm, and a thickness at the center of 10mm. The lens also has a back focal length (BFL) of 12.46mm, which is the distance from the rear surface of the lens to the point at which the light rays converge.
The lens's aspheric shape is defined by its radii (r1 and r2), which are 11.046mm and 0mm respectively, and its conic constant (k1), which is -0.8305669. The aspheric shape helps to correct spherical aberration, a common optical problem where light rays do not all focus at the same point.
