User contributions
- 00:49, 20 October 2017 (diff | hist) . . (+1) . . m User:Effie58973 (current)
- 11:45, 19 October 2017 (diff | hist) . . (-168) . . m User:Effie58973
- 00:15, 19 October 2017 (diff | hist) . . (+2,069) . . N User:Effie58973 (Created page with "What's an achromatic lens?<br><br>An achromatic lens or Achromat is a lens that is created for the purpose of restricting the effects of lens(chromatic and spherical) aberrati...")
