47-644 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=175mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 175 mm
- R1
- 109.16 mm
- R2
- -79.38 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
47-644 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=175mm VIS 0° 425-675nm
The 47-644 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and an effective focal length (EFL) of 175mm, specifically designed for the visible light spectrum ranging from 425 to 675nm. This lens is sourced from the reputable optical vendor, Edmund Optics, and is available for purchase through their website.
The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, ensuring excellent optical performance. The front and back surfaces of the lens are coated with the EDM VIS-0 standard curve coating, providing superior light transmission and protection against environmental factors.
The lens geometry is intricately designed, with a thickness of 7.94mm at the edge, a center thickness of 6mm, and a center thickness 'a' of 3mm. The lens features three radii: r1 at 109.16mm, r2 at -79.38mm, and r3 at -226.03mm. The inner and outer radii are both zero, indicating a circular shape.
This lens is a multiplet, meaning it is composed of multiple elements, which allows for superior optical performance compared to a single element lens. The 47-644 is an ideal choice for applications requiring high-quality imaging and light transmission within the specified visible light spectrum.
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