49-768 25.4 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=76.2mm MgF2 400-700nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- 76.2 mm
- R1
- 50.85 mm
- R2
- -40.06 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
49-768 25.4 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=76.2mm MgF2 400-700nm
The 49-768 is a high-quality achromatic doublet lens from Edmund Optics, designed with a 25.4 mm diameter and a focal length of 76.2 mm. 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-SSK8 and N-SF56, both from Schott. These materials are known for their excellent optical properties, contributing to the lens's high-performance characteristics. The lens is coated with Edmund Optics' standard MgF2 coating on both the front and back surfaces, which provides broadband anti-reflection performance in the 400-700 nm range.
The geometry of the lens is carefully designed to optimize its optical performance. The edge thickness is 7.85 mm, while the center thickness is 7 mm with an additional 3 mm step in the center. The lens's inner and outer radii are 0, indicating a symmetrical design. The first radius of curvature (r1) is 50.85 mm, and the second radius (r2) is -40.06 mm, followed by a third radius (r3) of -148.78 mm.
