User contributions
- 21:04, 19 October 2017 (diff | hist) . . (-199) . . m User:SeanHsq265 (current)
- 01:57, 19 October 2017 (diff | hist) . . (+2,121) . . N User:SeanHsq265 (Created page with "What's an achromatic lens?<br><br>An achromatic lens or Achromat is a lens that is produced with the goal of limiting the consequences of lens(chromatic and spherical) aberrat...")
