49-781 25.4 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=76.2mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- 76.2 mm
- R1
- 50.85 mm
- R2
- -40.06 mm
Material 1
- Name
- N-SSK8
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6203679865890697
- λ
- 550 nm
- B1
- 1.44857867
- C1
- 0.00869310149 μm2
- B2
- 0.117965926
- C2
- 0.0421566593 μm2
- B3
- 1.06937528
- C3
- 111.300666 μm2
Material 2
- Name
- N-SF56
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.791037231451858
- λ
- 550 nm
- B1
- 1.73562085
- C1
- 0.0129624742 μm2
- B2
- 0.317487012
- C2
- 0.0612884288 μm2
- B3
- 1.95398203
- C3
- 161.559441 μm2
49-781 25.4 mm Dia. N-SSK8/N-SF56 Achromatic Doublet; EFL=76.2mm VIS 0° 425-675nm
The 49-781 is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens is specifically designed for use within the visible light spectrum, spanning from 425 to 675 nanometers. The lens boasts a diameter of 25.4 millimeters and an effective focal length (EFL) of 76.2 millimeters, making it suitable for a wide range of optical applications.
The lens is composed of two distinct materials, N-SSK8 and N-SF56, both from the reputable Schott glass catalog. This combination of materials aids in the reduction of chromatic aberration, a common issue in optical systems. The lens features a standard coating on both the front and back surfaces, specifically the EDMP VIS-0 STD CURVE coating, which further enhances its performance and durability.
The geometry of the lens is carefully crafted, with a thickness at the edge of 7.85 millimeters and a central thickness of 7 millimeters. The inner and outer radii are zero, indicating a symmetrical design. The lens also features a radius of curvature of 50.85 millimeters on the first surface and -40.06 millimeters on the second surface, with a third surface radius of -148.78 millimeters.
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