SLB-20B-20NM 20.0 mm Dia. x -19.7 mm FL; Coated; Double-Concave Lens 400-700nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- OptoSigma
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- -19.7 mm
- BFL
- -20.3 mm
- R1
- -20.76 mm
- R2
- 20.76 mm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.518720636186463
- λ
- 546.1 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
SLB-20B-20NM 20.0 mm Dia. x -19.7 mm FL; Coated; Double-Concave Lens 400-700nm
The SLB-20B-20NM is a high-quality double-concave lens, designed and manufactured by OptoSigma. This lens, with a base shape of a circle, is specifically engineered for use within the wavelength range of 400-700nm, making it suitable for a wide range of optical applications.
The lens boasts a diameter of 20.0 mm and a center thickness of 2.0 mm, ensuring a compact and efficient design. The edge thickness is 7.1 mm, providing robustness and durability. The effective focal length (EFL) of this lens is -19.7 mm, and the back focal length (BFL) is -20.3 mm, indicating a strong converging capability.
The lens is made from n-BK7 Schott, a popular optical glass known for its excellent optical properties and chemical durability. The double-concave geometry, with radii of curvature R1 at -20.76 mm and R2 at 20.76 mm, further enhances its optical performance.
The SLB-20B-20NM comes with a coating on both the front and back surfaces. This coating, identified as 'opt m', is designed to optimize the lens's performance within its specified wavelength range.
