Notes about Hα images

  • The image diameter is about 64 mm
  • Time is CET until March 1981, then UT
  • The image are taken with a 80 mm objective and an orange broad band filter on planfilm (9×12 cm) Typolith by Typon until 1974, and then on Ilford Line 4E50
  • Manual development with Kodalith and Ilfolith detectors

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