45-021 20.0mm Dia. x -30 FL; MgF2 Coated; Plano-Concave Lens 400-700nm
- Type
- Lens
- Subtype
- Spherical Lens (Plano-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- -30 mm
- BFL
- -31.96 mm
- R1
- -23.54 mm
Material
- Name
- N-SF11
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.7847141030246312
- λ
- 587.6 nm
- B1
- 1.73759695
- C1
- 0.013188707 μm2
- B2
- 0.313747346
- C2
- 0.0623068142 μm2
- B3
- 1.89878101
- C3
- 155.23629 μm2
45-021 20.0mm Dia. x -30 FL; MgF2 Coated; Plano-Concave Lens 400-700nm
The 45-021 is a plano-concave lens with a diameter of 20.0mm, a focal length of -30, and a central thickness of 3.5mm. The lens is sourced from Edmund Optics, a leading manufacturer in the optical industry, and is currently in stock.
This lens is made from n-sf11 Schott, a high-index glass with excellent optical properties. It features a magnesium fluoride (MgF2) coating on both the front and back surfaces, which is standard for this type of lens. The MgF2 coating reduces reflection and increases transmission, making it ideal for applications that require high light transmission, such as imaging systems, beam shaping, and collimation.
The lens has a spherical shape, with a radius of curvature of -23.54mm on the concave surface. The back face is flat, hence the term 'plano-concave'. The lens has a clear aperture of 20.0mm and an effective focal length (EFL) of -30mm. The back focal length (BFL) is -31.96mm.
The 45-021 is designed for use in the visible spectrum, specifically between 400 and 700nm. This makes it suitable for a wide range of applications, including but not limited to, machine vision, biomedical imaging, and scientific research.