89-681 40 mm Dia. N-SK11/N-SF5 Achromatic Doublet; EFL=50mm MgF2 400-700nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 40 mm
- EFL
- 50 mm
- R1
- 28.56 mm
- R2
- -29.97 mm
Material 1
- Name
- N-SK11
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5658215515592446
- λ
- 550 nm
- B1
- 1.17963631
- C1
- 0.00680282081 μm2
- B2
- 0.229817295
- C2
- 0.0219737205 μm2
- B3
- 0.935789652
- C3
- 101.513232 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
89-681 40 mm Dia. N-SK11/N-SF5 Achromatic Doublet; EFL=50mm MgF2 400-700nm
The 89-681 is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens is designed with a base shape of 40 mm diameter and a focal length of 50 mm, making it suitable for a wide range of optical applications.
The lens is constructed from two types of glass, N-SK11 and N-SF5, both from the reputable Schott glass catalog. This combination of materials helps to minimize chromatic aberration, a common issue in optical systems, thereby enhancing the overall image quality.
The 89-681 features a robust geometry, with a thickness of 16.52 mm at the edge and 19 mm at the center. The lens also has a significant inner radius and outer radius, both of which are 0, indicating a symmetrical design. The r1 and r2 radii are 28.56 mm and -29.97 mm respectively, while the r3 radius is 153.67 mm. The center thickness 'a' is 7 mm.
The lens is coated with Edmund Optics' standard MgF2 coating on both the front and back surfaces. This coating, within the 400-700nm wavelength range, enhances the lens's light transmission capabilities and provides excellent protection against environmental factors.
