Chromatic aberration

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  • f = l/d = focal ratio
  • i = f/(d/[in.]) = chromatic aberration index (CAI) [1]
  • i[Sidgwick] > 3 = Sidgwick standard
  • i[Sacek] > 2.25 = Sacek standard
  • i[18/4.0] = 29 > 3
  • i[37/7.2] = 18 > 3
  • i[55/9.8] = 14 > 3
  • i[2·55/12] = 19 > 3
  • i[2·150/30] = 8.5 > 3
  • i[2·250/45] = 6.4 > 3
  • i[55/12] = 9.4 > 3
  • i[150/30] = 4.2 > 3
  • i[250/45] = 3.2 > 3
  • i[1000/90] = 3.1 > 3
  • i[360/60] ≈ 3 = 2.5 > 2.3

references

  1. https://www.whichtelescope.com/aberrations.htm