69-922 12.7 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=125mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 12.7 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
69-922 12.7 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=125mm VIS 0° 425-675nm
The 69-922 is a high-quality achromatic doublet lens, boasting a 12.7 mm diameter and an effective focal length (EFL) of 125mm, specifically designed for the visible light spectrum ranging from 425 to 675nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase through their official website.
The lens is constructed from two types of materials, N-BK7 and N-SF5, both from Schott, ensuring superior optical performance. The front and back surfaces of the lens are coated with EDM VIS-0 standard curve coatings, providing excellent light transmission and protection against environmental factors.
The lens geometry is meticulously designed, with a thickness of 6.11mm at the edge, a center thickness of 4.5mm, and a center thickness 'a' of 2mm. The lens features three radii of curvature: r1 at 76.92mm, r2 at -55.48mm, and r3 at -162.59mm. The inner and outer radii are both zero, indicating a circular shape.
This achromatic doublet lens is a multiplet, meaning it is composed of multiple optical elements. This design helps to correct chromatic aberration, a common issue in optical systems, providing clear, sharp images across the entire visible light spectrum.
