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49-770 25.4 mm Dia. N-BAK1/N-SF15 Achromatic Doublet; EFL=101.6mm MgF2 400-700nm

49-770 25.4 mm Dia. N-BAK1/N-SF15 Achromatic Doublet; EFL=101.6mm MgF2 400-700nm

Type
Lens
Subtype
Multiplets
Brand
Edmund Optics
Product webpage
Edmund Optics products in the 3DOptix catalog

Properties

Shape
Circular
Diameter
25.4 mm
EFL
101.6 mm
R1
66.33 mm
R2
-47.95 mm

Material 1

Name
N-BAK1
Dispersion Equation
Sellmeier
n (λ)
1.5746241031015316
λ
550 nm
B1
1.12365662
C1
0.00644742752 μm2
B2
0.309276848
C2
0.0222284402 μm2
B3
0.881511957
C3
107.297751 μm2

Material 2

Name
N-SF15
Dispersion Equation
Sellmeier
n (λ)
1.7038049870312608
λ
550 nm
B1
1.57055634
C1
0.0116507014 μm2
B2
0.218987094
C2
0.0597856897 μm2
B3
1.50824017
C3
132.709339 μm2

49-770 25.4 mm Dia. N-BAK1/N-SF15 Achromatic Doublet; EFL=101.6mm MgF2 400-700nm

The 49-770 is a high-quality achromatic doublet lens from Edmund Optics, designed with a 25.4 mm diameter and a focal length of 101.6mm. This lens is a multiplet, meaning it is composed of multiple optical elements to achieve superior performance.

The lens is constructed from two types of glass, N-BAK1 and N-SF15, both from Schott. These materials are chosen for their specific refractive indices and dispersions, which contribute to the lens's ability to bring two wavelengths to a common focus, minimizing chromatic aberration.

The lens's geometry is carefully designed with a central thickness of 5mm and edge thickness of 6.32mm, providing structural integrity and optimal light transmission. The inner and outer radii are 0, indicating a symmetrical design that further enhances image quality.

The 49-770 is coated with EDM MgF2, a standard coating that provides excellent anti-reflection properties across the visible spectrum (400-700nm). This coating improves light transmission, reduces ghosting and flare, and enhances overall image contrast and clarity.

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