47-648 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=275mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 275 mm
- R1
- 171.03 mm
- R2
- -121.54 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
47-648 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=275mm VIS 0° 425-675nm
The 47-648 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and an effective focal length (EFL) of 275mm, 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 6.82mm edge thickness, 5mm center thickness, and 2.5mm center thickness 'a'. The inner and outer radii are 0, and the first and second radii of curvature are 171.03mm and -121.54mm, respectively. The third radius of curvature is -352.46mm.
This lens is a multiplet, meaning it is composed of multiple optical elements to achieve superior optical performance. The multiplet design, combined with the high-quality materials and coatings, makes this lens an excellent choice for various applications in the visible light spectrum.
