67-255 50 mm Dia. N-SF5 Precision Aspheric Lens; EFL=30mm; NA=0.83 BBAR 425-675nm
- Type
- Lens
- Subtype
- Aspheric Lens
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 50 mm
- EFL
- 30 mm
- BFL
- 18.04 mm
- R1
- 20.18 mm
- R2
Material
- Name
- N-SF5
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6727030184452947
- λ
- 587.6 nm
- B1
- 1.52481889
- C1
- 0.011254756 μm2
- B2
- 0.187085527
- C2
- 0.0588995392 μm2
- B3
- 1.42729015
- C3
- 129.141675 μm2
67-255 50 mm Dia. N-SF5 Precision Aspheric Lens; EFL=30mm; NA=0.83 BBAR 425-675nm
The 67-255 is a high-precision aspheric lens, boasting a 50 mm diameter and a numerical aperture (NA) of 0.83. This lens is fabricated from N-SF5 Schott, a high-refractive index glass, and is sourced from the reputable optical vendor, Edmund Optics.
The lens is designed with an effective focal length (EFL) of 30 mm, making it suitable for a wide range of optical applications. It features a broadband anti-reflection (BBAR) coating, which enhances its performance across the visible light spectrum, specifically between 425 and 675 nm. This coating reduces surface reflections, thereby increasing the amount of light transmitted through the lens.
The lens geometry is intricately designed, with an inner radius of 0 mm and an outer radius of 0 mm. It has a thickness of 1.44 mm at the edge and a center thickness of 20 mm. The front surface of the lens has a radius of curvature (R1) of 20.181 mm, while the back surface (R2) is flat. The back focal length (BFL) of the lens is 18.04 mm.
The lens is coated on both the front and back surfaces with the same BBAR coating, ensuring optimal performance from both sides. The coating specifications include a front surface coating of EDMBBAR 425-675 and a back surface coating of EDMBBAR 425-675.
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