62-493 25 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
- 25 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
62-493 25 mm Dia. N-BK7/N-SF5 Negative Achromatic Doublet; EFL=-75mm VIS 0° 425-675nm
The 62-493 is a high-quality negative achromatic doublet lens, sourced from Edmund Optics, offering impressive performance within the visible light spectrum of 425-675nm. This lens boasts a diameter of 25mm and an effective focal length (EFL) of -75mm, making it suitable for a wide range of applications.
The lens is constructed from two types of Schott glass: N-BK7 and N-SF5. These materials are carefully selected for their optical properties, contributing to the lens's ability to correct chromatic aberration, a common issue in optical systems. The negative achromatic design further enhances the lens's ability to focus light accurately, reducing spherical aberration and distortion.
The lens features a standard coating on both the front and back surfaces. This coating, identified as 'edm vis-0 std curve', is designed to enhance the lens's light transmission and reduce surface reflections, thereby improving overall system performance.
The lens geometry is also noteworthy. It has a thickness of 8.9mm at the edge, with a central thickness of 2.5mm. The lens also features three radii of curvature: r1 at -46.07mm, r2 at 36.65mm, and r3 at 108mm. These geometric features contribute to the lens's excellent optical performance.
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