49-957 20 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=50mm VIS-NIR 400-1000nm
- 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
49-957 20 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=50mm VIS-NIR 400-1000nm
The 49-957 is a high-quality achromatic doublet lens, boasting a 20 mm diameter and a focal length of 50 mm, specifically designed for the visual (VIS) and near-infrared (NIR) spectrum, spanning 400-1000nm. This lens is sourced from the reputable optical vendor, Edmund Optics, and is a multiplet type, ensuring superior image quality and minimal chromatic aberration.
The lens is crafted from two distinct materials, N-SSK8 and N-SF56, both from the esteemed Schott glass catalog. These materials are carefully selected to optimize the lens's performance in the VIS-NIR spectrum. The lens features a robust design, with a thickness of 4.78mm at the edge and 4.8mm at the center, ensuring durability and longevity.
The 49-957 is coated with Edmund Optics' proprietary VIS-NIR coating, denoted as edm visnir0sp2002000, on both the front and back surfaces. This coating enhances the lens's transmission capabilities and reduces surface reflections, further improving image quality.
