49-312 6.25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=60mm VIS-NIR 400-1000nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 6.25 mm
- EFL
- 60 mm
- R1
- 37.16 mm
- R2
- -26.28 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
49-312 6.25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=60mm VIS-NIR 400-1000nm
The 49-312 is a high-quality achromatic doublet lens, boasting a 6.25 mm diameter and a focal length of 60mm, specifically designed for the visible to near-infrared spectrum (400-1000nm). This lens is sourced from the renowned optical vendor, Edmund Optics, and is a versatile choice for a wide range of optical applications.
The lens is constructed from two types of materials, N-BK7 and N-SF5, both from Schott, ensuring superior optical performance. The N-BK7, a borosilicate crown glass, is known for its excellent optical transmission and low dispersion, making it ideal for use in achromatic doublets. The N-SF5, a dense flint glass, further reduces dispersion, contributing to the lens's high chromatic correction.
The 49-312 features a sophisticated geometry, with a central thickness of 2.3mm and edge thickness of 3.1mm. The radii of curvature for the first and second surfaces are 37.16mm and -26.28mm, respectively, while the third surface has a radius of -76.48mm. This complex design ensures minimal spherical and chromatic aberration, delivering sharp, clear images.
The lens is coated with Edmund Optics' VIS-NIR coating (edm visnir0sp2002000), which is applied to both the front and back surfaces. This coating enhances the lens's transmission in the visible to near-infrared spectrum, reducing reflection and improving overall light transmission.
