SLB-20B-25NM 20.0 mm Dia. x -24.7 mm FL; Coated; Double-Concave Lens 400-700nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- OptoSigma
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- -24.7 mm
- BFL
- -25.3 mm
- R1
- -25.95 mm
- R2
- 25.95 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-25NM 20.0 mm Dia. x -24.7 mm FL; Coated; Double-Concave Lens 400-700nm
The SLB-20B-25NM 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 20.0mm, with a thickness at the edge of 6.0mm and a center thickness of 2.0mm. The effective focal length (EFL) is -24.7mm, and the back focal length (BFL) is -25.3mm. The first radius of curvature (R1) is -25.95mm, while the second radius of curvature (R2) is 25.95mm. The lens is made from the high-quality material n-BK7 Schott, a borosilicate crown glass known for its excellent optical properties.
The SLB-20B-25NM comes with a coating on both the front and back surfaces. This coating, identified as 'opt m', is designed to enhance the lens' performance by reducing surface reflections and increasing transmission. The lens is currently in stock and available for immediate purchase, as indicated by its valid weblink status.