SLB-20B-20PM 20.0 mm Dia. x 21.2 mm FL; Coated; Double-Convex Lens 400-700nm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Convex)
- Brand
- OptoSigma
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- 21.2 mm
- BFL
- 18.8 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-20PM 20.0 mm Dia. x 21.2 mm FL; Coated; Double-Convex Lens 400-700nm
The SLB-20B-20PM is a high-quality double-convex lens, designed and manufactured by OptoSigma. This lens, with a diameter of 20.0 mm and a focal length of 21.2 mm, is made from the renowned material n-BK7 Schott, ensuring excellent optical performance.
The lens features a double-convex geometry, with radii of curvature of 20.76 mm for both the front and back surfaces. This geometry, combined with the lens's thickness at the edge (2.0 mm) and center (7.1 mm), results in a back focal length of 18.8 mm. The lens's effective focal length is 21.2 mm, making it suitable for a wide range of optical applications.
The SLB-20B-20PM is coated with OptoSigma's proprietary Opt M coating on both the front and back surfaces, enhancing its performance in the spectral range of 400-700 nm. This coating improves the lens's transmission and reduces reflection, making it an ideal choice for applications that require high light transmission and minimal loss.
