49-933-INK 20 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=50mm MgF2 400-700nm
- 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
49-933-INK 20 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=50mm MgF2 400-700nm
The 49-933-INK is a high-quality Achromatic Doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens, with a diameter of 20 mm, is designed for use in the visible light spectrum, specifically between 400-700nm. The lens boasts an effective focal length (EFL) of 50mm, making it suitable for a wide range of optical applications.
The lens is composed of two elements, N-SSK8 and N-SF56, both from Schott. These materials are known for their excellent optical properties, contributing to the lens's high performance. The lens is coated with Edmund Optics' standard MgF2 coating on both the front and back surfaces, which enhances its light transmission capabilities and reduces surface reflections.
The geometry of the lens is carefully designed to optimize its performance. The lens has a thickness of 4.78mm at the edge and 4.8mm at the center, with a center thickness 'a' of 2mm. The radii of the lens surfaces are R1 = 36.92mm, R2 = -25.65mm, and R3 = -77.89mm. The lens's base shape is circular, contributing to its wide field of view.
