45-818 9 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=40mm MgF2 400-700nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 9 mm
- EFL
- 40 mm
- R1
- 24.77 mm
- R2
- -18.01 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
45-818 9 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=40mm MgF2 400-700nm
The 45-818 is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens is designed with a 9 mm diameter and a focal length of 40 mm, making it suitable for a wide range of optical applications.
The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott. This combination is used to correct chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. The achromatic design ensures that the lens focuses both red and blue light to the same point, providing sharper images.
The lens features a standard MgF2 coating on both the front and back surfaces. This coating reduces reflection and increases transmission in the 400-700 nm range, making the lens more efficient and improving image quality.
The geometry of the lens includes a thickness of 4.59 mm at the edge, with the center thickness being 3.73 mm. The lens also has a curvature radius of 24.77 mm on the first surface and -18.01 mm on the second surface, with a third surface radius of -51.17 mm. The lens is designed to be used in a multiplet configuration.
