49-945 20 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=50mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- 50 mm
- R1
- 36.92 mm
- R2
- -25.65 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
49-945 20 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=50mm VIS 0° 425-675nm
The 49-945 is a high-quality achromatic doublet lens, boasting a 20 mm diameter and an effective focal length (EFL) of 50mm, specifically designed for the visible light spectrum ranging from 425 to 675nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase through their official website.
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 lens systems. The front and back surfaces of the lens are coated with the EDM VIS-0 standard curve coating, enhancing its light transmission capabilities and providing excellent protection against environmental factors.
The lens geometry is meticulously designed, with a thickness of 4.78mm at the edge and 4.8mm at the center. The first and second radii (r1 and r2) are 36.92mm and -25.65mm respectively, while the third radius (r3) is -77.89mm. The center thickness of the lens is 2mm, contributing to its robustness and durability.
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