67-658 25mm Dia. x 400mm FL; NIR II Coated; DCX N-K5 Lens NIR II 750-1550nm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Convex)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 400 mm
- BFL
- 398.75 mm
- R1
- 417.54 mm
- R2
- -417.54 mm
Material
- Name
- N-K5
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5224870269234316
- λ
- 587.6 nm
- B1
- 1.08511833
- C1
- 0.00661099503 μm2
- B2
- 0.199562005
- C2
- 0.024110866 μm2
- B3
- 0.930511663
- C3
- 111.982777 μm2
67-658 25mm Dia. x 400mm FL; NIR II Coated; DCX N-K5 Lens NIR II 750-1550nm
The 67-658 is a high-quality lens from Edmund Optics, designed for use in the near-infrared (NIR) spectrum, specifically between 750 and 1550nm. This lens, with a diameter of 25mm and a focal length of 400mm, is a spherical lens of the convex-convex type, making it suitable for a wide range of optical applications.
The lens is made from N-K5 Schott glass, a material known for its excellent optical properties in the NIR spectrum. The geometry of the lens is carefully crafted, with a thickness at the edge of 4.63mm and a center thickness of 5mm. The effective focal length (EFL) is 400mm, and the radii of the two spherical surfaces are 417.54mm and -417.54mm, respectively. The back focal length (BFL) is 398.75mm.
The 67-658 lens features a standard NIR-II coating on both the front and back surfaces. This coating, developed by Edmund Optics, is designed to optimize the lens' performance in the NIR spectrum, reducing unwanted reflections and increasing transmission.