49-762 12.7 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=38.1mm MgF2 400-700nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 12.7 mm
- EFL
- 38.1 mm
- R1
- 25.43 mm
- R2
- -20.03 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
49-762 12.7 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=38.1mm MgF2 400-700nm
The 49-762 is a high-quality achromatic doublet lens from Edmund Optics, designed with a 12.7 mm diameter and a focal length of 38.1 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 Schott glass, N-SSK8 and N-SF56, which are renowned for their optical properties. The N-SSK8 is used for the first element, while the N-SF56 is used for the second. This combination helps to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points.
The lens features a standard MgF2 coating on both the front and back surfaces. This coating is designed to improve the lens's light transmission and reduce reflection, particularly in the visible spectrum (400-700 nm). The coating is also hardened to increase its durability and resistance to scratches and other forms of damage.
The geometry of the lens is carefully designed to optimize its performance. The edge thickness is 3.92 mm, while the center thickness is 3.5 mm. The lens also features a central thickness 'a' of 1.5 mm. The inner and outer radii are not specified, indicating that they are not critical to the lens's performance.
