89-158 15mm 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
- 15 mm
- EFL
- 20 mm
- BFL
- 18.99 mm
- R1
- 30.6 mm
- R2
- -30.6 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
89-158 15mm Dia. x 20mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm
The 89-158 is a double-convex lens offered by Edmund Optics, boasting a diameter of 15mm and a focal length of 20mm. This lens is specifically designed for use within the visible light spectrum, spanning from 350 to 700nm, making it suitable for a wide range of optical applications.
The lens is crafted 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 within the visible spectrum. This coating reduces surface reflections, thereby improving the overall efficiency and clarity of the lens.
The geometry of the lens is characterized by its edge thickness of 1.63mm and center thickness of 3.5mm. The lens's effective focal length (EFL) is 20mm, while its back focal length (BFL) is 18.99mm. The first and second radii of curvature are 30.6mm and -30.6mm, respectively. The lens's inner and outer radii are both zero, indicating a uniform curvature across the lens surface.
