47-650 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=400mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 400 mm
- R1
- 244.65 mm
- R2
- -179.62 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
47-650 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=400mm VIS 0° 425-675nm
The 47-650 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and an effective focal length (EFL) of 400mm, 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 protection against environmental factors.
The lens geometry is intricately designed with precise radii and thicknesses. The first radius (r1) is 244.65, the second radius (r2) is -179.62, and the third radius (r3) is -534.1. The edge thickness is 5.03, while the center thickness is 3, with an 'a' variant of 2.5. The lens's inner and outer radii are both zero, indicating a circular shape.
This lens is a multiplet, meaning it is composed of multiple optical elements. The multiplet design helps to correct chromatic aberration, a common issue in lens systems, making this lens an excellent choice for a wide range of optical applications.
