89-138 9mm Dia. x 18mm 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
- 9 mm
- EFL
- 18 mm
- BFL
- 17.12 mm
- R1
- 18.15 mm
- R2
- -18.15 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
89-138 9mm Dia. x 18mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm
The 89-138 is a double-convex lens with a 9mm diameter and a focal length of 18mm. This lens is sourced from Edmund Optics and is currently in stock. It is made of n-BK7 Schott material, a popular choice for its high refractive index and low dispersion, making it ideal for a wide range of optical applications.
The lens features a double-convex geometry, meaning it has two spherical surfaces that curve outwards. This design is often used to increase the optical power of a lens or to reduce spherical aberration. The lens has an inner radius of 0 and an outer radius of 0, indicating a symmetrical design.
The 89-138 lens is coated with EDM VIS-EXT on both the front and back surfaces. This coating is designed to extend the visible range of the lens, making it suitable for use in applications where a broad spectrum of light needs to be captured or transmitted, typically within the 350-700nm range.
The lens has a thickness of 1.47mm at the edge and 2.6mm at the center. The effective focal length (EFL) is 18mm, and the back focal length (BFL) is 17.12mm. This information is crucial for designing optical systems as it helps determine the position and orientation of the lens within the system.
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