47-736-INK 20 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=60mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- 60 mm
- R1
- 35.92 mm
- R2
- -28.12 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
47-736-INK 20 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=60mm VIS 0° 425-675nm
The 47-736-INK is a high-quality achromatic doublet lens, boasting a 20 mm diameter and an effective focal length (EFL) of 60 mm, specifically designed for the visible spectrum between 425-675 nm. This lens is sourced from Edmund Optics, a renowned vendor known for their exceptional optical components.
The lens is constructed from two types of glass: N-BK7 and N-SF5, both from Schott, ensuring superior optical performance. The N-BK7, a borosilicate crown glass, is known for its low dispersion and excellent homogeneity, while the N-SF5, a fluorite crown glass, offers a low refractive index and low dispersion. This combination effectively minimizes chromatic aberration, a common issue in optical systems.
The lens features a standard anti-reflection coating on both the front and back surfaces, specifically the EDM VIS-0 STD CURVE coating. This coating enhances light transmission, reduces surface reflections, and increases the overall efficiency of the optical system.
The lens geometry is meticulously designed, with a central thickness of 5 mm and edge thickness of 4.98 mm. The radii of curvature are R1 = 35.92 mm, R2 = -28.12 mm, and R3 = -83.79 mm, providing the lens with its unique optical properties.
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