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49-939 9 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=22.5mm VIS 0° 425-675nm

49-939 9 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=22.5mm VIS 0° 425-675nm

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

Properties

Shape
Circular
Diameter
9 mm
EFL
22.5 mm
R1
14.79 mm
R2
-12.09 mm

Material 1

Name
N-SSK8
Dispersion Equation
Sellmeier
n (λ)
1.6203679865890697
λ
550 nm
B1
1.44857867
C1
0.00869310149 μm2
B2
0.117965926
C2
0.0421566593 μm2
B3
1.06937528
C3
111.300666 μm2

Material 2

Name
N-SF56
Dispersion Equation
Sellmeier
n (λ)
1.791037231451858
λ
550 nm
B1
1.73562085
C1
0.0129624742 μm2
B2
0.317487012
C2
0.0612884288 μm2
B3
1.95398203
C3
161.559441 μm2

49-939 9 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=22.5mm VIS 0° 425-675nm

The 49-939 is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens is specifically designed for use within the visible light spectrum, spanning from 425 to 675 nanometers. The lens boasts a 9mm diameter and an effective focal length of 22.5mm, making it suitable for a wide range of optical applications.

The lens is constructed from two types of Schott glass, N-SSK8 and N-SF56, which are carefully selected to minimize chromatic aberration, a common issue in optical systems. The lens features a standard curve coating on both the front and back surfaces, further enhancing its performance by reducing reflection and improving transmission.

The geometry of the lens is meticulously designed, with a center thickness of 3mm and edge thickness of 3.58mm. The lens curvature is also precisely controlled, with radii of 14.79mm and -12.09mm for the first and second surfaces, respectively, and a -45.72mm radius for the third surface. This complex geometry allows the lens to deliver sharp, clear images with minimal distortion.

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