89-171 20mm Dia. x 40mm 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
- 40 mm
- BFL
- 38.44 mm
- R1
- 40.67 mm
- R2
- -40.67 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
89-171 20mm Dia. x 40mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm
The 89-171 is a high-quality double-convex lens, boasting a 20mm diameter and a focal length of 40mm. This lens is sourced from the reputable vendor, Edmund Optics, and is available in stock for immediate use. The 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 Schott's n-BK7 glass, a popular choice due to its excellent optical properties and versatility. The lens features a front and back coating of EDM VIS-EXT, which is designed to enhance the lens's performance within the visible light spectrum. This coating aids in reducing surface reflections and increasing transmission, thereby improving the overall efficiency and quality of the optical system.
The lens's geometry is characterized by its double-convex shape, with a center thickness of 5.3mm and an edge thickness of 2.8mm. The inner and outer radii are 0mm, and the lens has a base shape of a circle. The effective focal length (EFL) is 40mm, and the back focal length (BFL) is 38.44mm.
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