49-770 25.4 mm Dia. N-BAK1/N-SF15 Achromatic Doublet; EFL=101.6mm MgF2 400-700nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- 101.6 mm
- R1
- 66.33 mm
- R2
- -47.95 mm
Material 1
- Name
- N-BAK1
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5746241031015316
- λ
- 550 nm
- B1
- 1.12365662
- C1
- 0.00644742752 μm2
- B2
- 0.309276848
- C2
- 0.0222284402 μm2
- B3
- 0.881511957
- C3
- 107.297751 μm2
Material 2
- Name
- N-SF15
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.7038049870312608
- λ
- 550 nm
- B1
- 1.57055634
- C1
- 0.0116507014 μm2
- B2
- 0.218987094
- C2
- 0.0597856897 μm2
- B3
- 1.50824017
- C3
- 132.709339 μm2
49-770 25.4 mm Dia. N-BAK1/N-SF15 Achromatic Doublet; EFL=101.6mm MgF2 400-700nm
The 49-770 is a high-quality achromatic doublet lens from Edmund Optics, designed with a 25.4 mm diameter and a focal length of 101.6mm. 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-BAK1 and N-SF15, both from Schott. These materials are chosen for their specific refractive indices and dispersions, which contribute to the lens's ability to bring two wavelengths to a common focus, minimizing chromatic aberration.
The lens's geometry is carefully designed with a central thickness of 5mm and edge thickness of 6.32mm, providing structural integrity and optimal light transmission. The inner and outer radii are 0, indicating a symmetrical design that further enhances image quality.
The 49-770 is coated with EDM MgF2, a standard coating that provides excellent anti-reflection properties across the visible spectrum (400-700nm). This coating improves light transmission, reduces ghosting and flare, and enhances overall image contrast and clarity.
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