49-347 18 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=125mm VIS-NIR 400-1000nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 18 mm
- EFL
- 125 mm
- R1
- 76.92 mm
- R2
- -55.48 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
49-347 18 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=125mm VIS-NIR 400-1000nm
The 49-347 is a high-quality achromatic doublet lens, boasting an 18 mm diameter and a focal length of 125mm, specifically designed for the visual (VIS) and near-infrared (NIR) spectrum, spanning 400-1000nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for immediate use.
The lens is constructed from two types of Schott glass, N-BK7 and N-SF5, which are renowned for their excellent optical properties. The N-BK7, a borosilicate crown glass, is known for its low dispersion and high homogeneity, making it ideal for use in achromatic doublets. The N-SF5, a dense flint glass, complements the N-BK7 by correcting chromatic aberration, ensuring sharp and clear images across the entire spectral range.
The lens features a sophisticated geometry, with a central thickness of 4.5mm and edge thickness of 5.72mm. The first and second radii of curvature are 76.92mm and -55.48mm, respectively, while the third radius of curvature is -162.59mm. This complex geometry is designed to minimize optical aberrations and distortions, further enhancing the lens's performance.
The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000) on both the front and back surfaces. This coating is specifically designed to enhance the lens's performance in the VIS-NIR spectrum, reducing reflection and increasing transmission.
