89-168 20mm Dia. x 20mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Convex)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- 20 mm
- BFL
- 18.55 mm
- R1
- 30.25 mm
- R2
- -30.25 mm
Material
- Name
- N-SF11
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.7847141030246312
- λ
- 587.6 nm
- B1
- 1.73759695
- C1
- 0.013188707 μm2
- B2
- 0.313747346
- C2
- 0.0623068142 μm2
- B3
- 1.89878101
- C3
- 155.23629 μm2
89-168 20mm Dia. x 20mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm
The 89-168 is a double-convex lens offered by Edmund Optics, boasting a 20mm diameter and a focal length of 20mm. This lens is designed for use within the visible light spectrum, specifically between 350-700nm, making it suitable for a wide range of applications.
The lens is constructed from n-SF11 Schott, a high-index glass with excellent optical properties. The front and back surfaces of the lens are coated with EDM VIS-EXT, a broadband anti-reflection coating that enhances transmission and reduces surface reflections. This coating is designed to operate within the 350-700nm range, further optimizing the lens's performance in the visible spectrum.
The lens's geometry features a center thickness of 5mm and an edge thickness of 1.6mm. The inner and outer radii are not specified, indicating that they are not a significant factor in the lens's performance or application. The back focal length (BFL) is 18.55mm, which is crucial for determining the lens's position within an optical system.
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