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D25.4 Negative Achromatic Doublets

Featured Product from Daheng New Epoch Technology, Inc.

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These lenses are computer-optimized for infinite conjugate ratio. While the output rays do not actually meet to form a real point, they appear to be diverging from a virtual point located on the object side of the lens.

  • Material:Optical glass (crown and filnt)
  • Focal Length (f'):±2% at 587.6nm
  • Diameter(φ) Tolerance:+0.0/-0.10
  • Center Thickness(Tc):±0.1
  • Centration:3′
  • Form Error:1~5 fringes
  • Irregularity of Fringes:0.2~0.5 fringes
  • Surface Quality:60-40 scratch-dig
  • Coating:1/4 wave MgF2 coating at 550nm for 0°angle of incidence
  • Clear Aperture:90% diameter

An achromatic-doublet consists of a negative low-index(crown glass)cemented with a positive high-index(flint glass)lens.