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45-021 20.0mm Dia. x -30 FL; MgF2 Coated; Plano-Concave Lens 400-700nm

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
Product webpage
Edmund Optics products in the 3DOptix catalog

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.

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