47-697 6.25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=50mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 6.25 mm
- EFL
- 50 mm
- R1
- 30.77 mm
- R2
- -22.05 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
47-697 6.25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=50mm VIS 0° 425-675nm
The 47-697 is a high-quality achromatic doublet lens, boasting a 6.25 mm diameter and an effective focal length (EFL) of 50mm, 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. This combination ensures superior optical performance, minimizing chromatic aberration and delivering sharp, clear images. The lens features a standard anti-reflective coating, denoted as "edm vis-0 std curve" on both the front and back surfaces, further enhancing its light transmission capabilities.
The lens geometry is intricately designed, with a center thickness of 2mm and edge thickness of 2.77mm. The first and second radii of curvature are 30.77mm and -22.05mm, respectively, while the third radius of curvature is -64.6mm. The lens is shaped as a multiplet, which is a combination of multiple individual lenses to achieve specific optical properties.
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