Remarks on the photospheric 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 (9x12 cm) Typolith by Typon until 1974, and
then on Ilford Line 4E50
- Manual development with Kodalith and Ilfolith detectors
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