47-657 9 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=45mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 9 mm
- EFL
- 45 mm
- R1
- 27.83 mm
- R2
- -19.75 mm
Material 1
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5185223876207927
- λ
- 550 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
Material 2
- Name
- N-SF5
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6771143911586193
- λ
- 550 nm
- B1
- 1.52481889
- C1
- 0.011254756 μm2
- B2
- 0.187085527
- C2
- 0.0588995392 μm2
- B3
- 1.42729015
- C3
- 129.141675 μm2
47-657 9 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=45mm VIS 0° 425-675nm
The 47-657 is a high-quality achromatic doublet lens, sourced from Edmund Optics, featuring a 9 mm diameter and an effective focal length (EFL) of 45 mm. This lens is specifically designed for use within the visible light spectrum, spanning 425-675 nm.
The lens is constructed from two distinct materials: N-BK7 and N-SF5, both from Schott. This combination is strategically chosen to minimize chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. By combining these materials, the 47-657 achieves superior color correction, making it ideal for a wide range of applications.
The lens geometry is meticulously designed, with a thickness at the edge of 3.76 mm and a center thickness of 3 mm. The inner and outer radii are 0, and the lens features a first radius (r1) of 27.83 mm and a second radius (r2) of -19.75 mm. The third radius (r3) is -57.06 mm. These specifications contribute to the lens's overall performance and optical quality.
The 47-657 is coated with EDM VIS-0 std curve on both the front and back surfaces. This coating enhances the lens's durability and optical performance by reducing surface reflections and increasing transmission.
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