Difference between revisions of "Chromatic aberration"

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* <var>i</var>[250/45] = 3.2 > 3
 
* <var>i</var>[250/45] = 3.2 > 3
 
* <var>i</var>[1000/90] = 3.1 > 3
 
* <var>i</var>[1000/90] = 3.1 > 3
* <var>i</var>[360/60] ≈ 3 = 2.5 > 2.25
+
* <var>i</var>[360/60] ≈ 3 = 2.5 > 2.3
  
 
== references ==
 
== references ==

Revision as of 2021-04-13T20:31:42

  • 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