SLB-20-120NM 20.0 mm Dia. x -120.0 mm FL; Coated; Plano-Concave Lens 400-700nm
- Type
- Lens
- Subtype
- Spherical Lens (Plano-Concave)
- Brand
- OptoSigma
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- -120 mm
- BFL
- -121.3 mm
- R1
- -62.28 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-20-120NM 20.0 mm Dia. x -120.0 mm FL; Coated; Plano-Concave Lens 400-700nm
The SLB-20-120NM is a Plano-Concave Spherical Lens, a high-quality optical component sourced from OptoSigma. This lens boasts a 20.0 mm diameter and a focal length of -120.0 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 Plano-Concave geometry, specifically, features a flat front surface and a curved back surface with a radius of curvature of -62.28 mm. This geometry results in a back focal length of -121.3 mm, contributing to the lens's overall optical performance.
The SLB-20-120NM is coated with Opt M on both the front and back surfaces. This coating enhances the lens's performance in the 400-700nm wavelength range, providing improved transmission and reduced reflection. The lens has a thickness of 2.8 mm at the edge and 2 mm at the center, providing structural integrity while minimizing unnecessary weight.
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