49-359 25 mm Dia. N-SK11/N-SF5 Achromatic Doublet; EFL=85mm VIS-NIR 400-1000nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 85 mm
- R1
- 55.68 mm
- R2
- -38.37 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
49-359 25 mm Dia. N-SK11/N-SF5 Achromatic Doublet; EFL=85mm VIS-NIR 400-1000nm
The 49-359 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and an effective focal length of 85mm, specifically designed for the visible to near-infrared spectrum (400-1000nm). This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase on their official website.
The lens is constructed from two types of Schott glass, N-SK11 and N-SF5, which are renowned for their excellent optical properties. The lens features a sophisticated geometry, with a thickness of 6.05mm at the edge, and a center thickness of 5.01mm. The curvature of the lens is also precisely engineered, with radii of 55.68mm, -38.37mm, and -146.45mm, ensuring optimal image quality and minimal aberration.
The lens is coated with Edmund Optics' proprietary VIS-NIR coating (edm visnir0sp2002000), which is applied to both the front and back surfaces. This coating is designed to enhance the lens' performance in the visible to near-infrared spectrum, reducing reflection and increasing transmission.
