89-189 30mm Dia x 60mm 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
- 30 mm
- EFL
- 60 mm
- BFL
- 58.33 mm
- R1
- 61.15 mm
- R2
- -61.15 mm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5167984379050088
- λ
- 587.6 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
89-189 30mm Dia x 60mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm
The 89-189 is a double-convex lens with a diameter of 30mm and a focal length of 60mm, sourced from the reputable optical vendor, Edmund Optics. This lens is designed for use within the visible light spectrum, specifically between 350-700nm, making it suitable for a wide range of optical applications.
The lens is constructed from n-BK7 Schott, a high-quality optical glass known for its excellent transparency and low auto-fluorescence. The base shape of the lens is circular, and it features a double-convex geometry, with radii of curvature of 61.15mm for the first surface and -61.15mm for the second surface. This geometry results in a back focal length of 58.33mm.
The lens is coated with EDM VIS-EXT, a broadband anti-reflection coating specifically designed for use in the visible spectrum. This coating reduces surface reflections, enhancing the overall transmission of the lens. The edge thickness of the lens is 1.26mm, while the center thickness is 5mm, providing a robust and durable structure.
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