67-244 20 mm Dia. N-SF5 Precision Aspheric Lens; EFL=12.5mm; NA=0.8 Uncoated
- Type
- Lens
- Subtype
- Aspheric Lens
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- 12.5 mm
- BFL
- 7.12 mm
- R1
- 8.41 mm
- R2
Material
- Name
- N-SF5
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6727030184452947
- λ
- 587.6 nm
- B1
- 1.52481889
- C1
- 0.011254756 μm2
- B2
- 0.187085527
- C2
- 0.0588995392 μm2
- B3
- 1.42729015
- C3
- 129.141675 μm2
67-244 20 mm Dia. N-SF5 Precision Aspheric Lens; EFL=12.5mm; NA=0.8 Uncoated
The 67-244 is a high-precision aspheric lens offered by Edmund Optics. This lens, with a catalog number 67-244, is made from N-SF5 Schott, a high-index glass known for its excellent optical properties. The lens is uncoated, which means it does not have any additional layers to enhance its optical performance.
The lens has a base shape of a circle and a diameter of 20 mm. The edge thickness of the lens is 1.91 mm, and it has an effective focal length (EFL) of 12.5 mm. The numerical aperture (NA) of the lens is 0.8, indicating its high light-gathering capability.
The lens's geometry is defined by several parameters. The inner radius is 0, and the outer radius is also 0, suggesting a symmetrical design. The lens's thickness at the edge is 1.91 mm, and it increases to 9 mm at the center. The lens's conic constant (k1) is -1.312935, indicating its aspheric nature.
The lens is designed to operate at a wavelength of 587.6 nm. It does not have any coatings, which means it may not perform optimally in high-intensity light conditions or in applications where scattering or reflection needs to be minimized.
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