62-489 12.5 mm Dia. N-BK7/N-SF5 Negative Achromatic Doublet; EFL=-75mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 12.5 mm
- EFL
- -75 mm
- R1
- -46.07 mm
- R2
- 36.65 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
62-489 12.5 mm Dia. N-BK7/N-SF5 Negative Achromatic Doublet; EFL=-75mm VIS 0° 425-675nm
The 62-489 is a high-quality, 12.5 mm diameter Negative Achromatic Doublet lens, designed and manufactured by Edmund Optics. This lens boasts an effective focal length (EFL) of -75mm, specifically tailored for the visible light spectrum, spanning 425-675nm.
The lens is constructed from two distinct materials, N-BK7 and N-SF5, both from Schott's extensive catalog. This combination ensures superior optical performance, minimizing chromatic aberration and delivering sharp, clear images. The lens features a robust design, with a thickness of 6.05mm at the edge and 2.5mm at the center, providing excellent structural integrity.
The 62-489 is coated with Edmund Optics' standard Vis-0 coating on both the front and back surfaces. This coating is specifically designed to optimize performance within the visible light spectrum, further enhancing the lens's optical capabilities.
This lens is a multiplet, meaning it is composed of multiple individual lenses. The curvature of these lenses is precisely engineered to provide the best possible optical performance. The first lens has a radius of curvature (R1) of -46.07mm, while the second lens has an R2 of 36.65mm and the third lens has an R3 of 108mm.
