49-958-INK 20 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=80mm VIS-NIR 400-1000nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 20 mm
- EFL
- 80 mm
- R1
- 50.49 mm
- R2
- -37.06 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
49-958-INK 20 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=80mm VIS-NIR 400-1000nm
This is a 20 mm diameter achromatic doublet lens, manufactured by Edmund Optics, with a catalog number 49-958-INK. The lens is currently in stock and available for purchase through the provided weblink. The lens is designed for use in the visible to near-infrared spectrum, spanning 400 to 1000 nanometers.
The lens is a multiplet, specifically an achromatic doublet, meaning it is composed of two elements made from different materials to correct chromatic aberration. The first element is made from N-BK7, a common crown glass, and the second from N-SF5, a dense flint glass. These materials are sourced from Schott, a renowned optical glass manufacturer.
The lens has an effective focal length (EFL) of 80mm, making it suitable for moderate magnification applications. The lens geometry includes a central thickness of 4mm, with the edge thickness measuring 4.51mm. The lens features a front and back coating of EDm VIS-NIR 0SP2002000, providing broadband anti-reflection coating for the visible and near-infrared spectrum.
This lens is ideal for applications that require high-quality imaging or light collection in the visible to near-infrared range, such as spectroscopy, machine vision, or optical metrology.
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