light clouds, but enough to produce a nice corona and hinder the making of some nice astronomical pictures.
The difficulty with pictures like these is the difference of brightness of the full moon and the corona itself. Your eyes are in this respect much better than a camera. For this picture I used two exposures, one for the full moon and one for the corona
Just finished a book on the history of Fraunhofer and the glass industry in Bavaria and England. Fraunhofer discovered the dark lines in the solar spectrum and used them extensively to improve the quality of glass. This was essential for building high quality refractor telescopes.
In this case your eyes are hard to beat. What you easily see is hard to get in one exposure. The main picture is a combination of two exposures (shown in the PiP). Both exposures have f=70 mm, f/2,8 and ISO 400. The exposure times are different, i.e. 1/40 and 1/3 sec.
Eine Hauch von Sahara Sand? Um dieser Zeitpunkt ist es normalerweise nicht möglich ohne schutz in die Sonne zu blicken. Die Sonne war deutlich abgeschwächt, aber nicht "wässrig" wie etwa bei leichte Bewölkung.
Das zweite PiP zeigt die Sonne im Oktober 2017, ganz klar eine Folge vom Sahara Sand in der Atmosphere
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