47-720 30 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=300mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 30 mm
- EFL
- 300 mm
- R1
- 184.4 mm
- R2
- -133.95 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
47-720 30 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=300mm VIS 0° 425-675nm
The 47-720 is a high-quality achromatic doublet lens, boasting a 30 mm diameter and an effective focal length (EFL) of 300mm, 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 improved light transmission and reduced surface reflections.
The lens geometry is carefully designed with a 6.12mm thickness at the edge, a 4.5mm thickness at the center, and a 2.5mm thickness at the center a. The lens curvature is defined by three radii: r1 at 184.4mm, r2 at -133.95mm, and r3 at -394.96mm. The inner and outer radii are both zero.
This achromatic doublet lens is a multiplet type, designed to bring two wavelengths into focus on the same plane, minimizing chromatic aberration. The detailed specifications and high-quality materials make the 47-720 an excellent choice for a wide range of optical applications.
