SLB-20B-70PM 20.0 mm Dia. x 70.6 mm FL; Coated; Double-Convex Lens 400-700nm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Convex)
- Brand
- OptoSigma
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- 70.6 mm
- BFL
- 69.4 mm
- R1
- 72.66 mm
- R2
- -72.66 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-70PM 20.0 mm Dia. x 70.6 mm FL; Coated; Double-Convex Lens 400-700nm
The SLB-20B-70PM is a high-quality spherical lens, specifically a double-convex lens, sourced from OptoSigma. This lens boasts a diameter of 20.0 mm and a focal length of 70.6 mm, making it suitable for a wide range of optical applications.
The lens is made from n-bk7 schott, a popular material in the optical industry due to its excellent optical properties. The base shape of the lens is circular, and it features a double-convex geometry, with radii of curvature of 72.66 mm for the first surface and -72.66 mm for the second surface. This geometry contributes to the lens's high optical power and excellent image quality.
The lens has a thickness of 2 mm at the edge and 3.4 mm at the center. The effective focal length (EFL) is 70.6 mm, and the back focal length (BFL) is 69.4 mm. The lens is coated with an opt m coating on both the front and back surfaces, which enhances its transmission capabilities within the 400-700nm wavelength range.
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