89-172 20mm Dia. x 50mm 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
- 50 mm
- BFL
- 48.84 mm
- R1
- 51.08 mm
- R2
- -51.08 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
89-172 20mm Dia. x 50mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm
The 89-172 is a high-quality double-convex lens, boasting a 20mm diameter and a focal length of 50mm. This lens is sourced from the reputable optical vendor, Edmund Optics, and is available for immediate purchase, as indicated by its "in stock" status on the vendor's website.
The lens is constructed from Schott's n-BK7 glass, a popular material in the optical industry due to its excellent optical properties and versatility. The lens features a front and back coating of EDM VIS-EXT, a broadband anti-reflection coating designed for use in the visible spectrum, specifically between 350 and 700nm. This coating enhances the lens's performance by reducing surface reflections, thereby increasing transmission and improving image quality.
The lens's geometry is characterized by its diameter, thickness, and radii of curvature. The diameter is 20mm, and the edge thickness is 1.52mm, while the center thickness is 3.5mm. The first radius of curvature (R1) is 51.08mm, and the second radius of curvature (R2) is -51.08mm, indicating a double-convex shape. The back focal length (BFL) is 48.84mm, and both the inner and outer radii are 0mm, suggesting a symmetrical design.