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Symmrtric-concave Spherical lenses

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  • Symmetric concave lenses are manufactured with both concave surfaces. They have negative focal lengths. These lenses are often used to expand light or to increase focal lengths in existing systems. Also, they can be used in laser beam expander, optical characterreaders, viewers, and projection systems..
  • Focal Length: n:refractive index
    R:radius curvature

Specifications

  • Material: Crown, Flint, UVFS
    Focal Length Tolerance: ±0.5%
    Diameter Tolerance: +0/-0.2mm
    Thickness Tolerance: ±0.2mm
    Surface Flatness: λ/10
    Centration Error: <3 arcmin
    Surface Quality: 20/10
    Clear Aperture: >90% of central diameter
    Coating: According to the requirements