Sonnenflecken / Sun Spots - 20210630
I had followed the development of these sunspot groups for the last couple of days on
solarmonitor.org without any hope for clear skies with a sufficiently good seeing, because we have lots of damp air, many clouds and often enough a fully cloud covered sky for a while now: summer in the Alps!
Nevertheless, looking out of the window this late afternoon, I realized we had short enough, cloudless and deep blue "window" between the clouds. I took my chance and went out. Happily there is no need for prior polar alignment or long exposure times to catch the sun light. To avoid air turbulences and improve seeing, I took 150 shots in 5 series of 30 shots each. The camera was set to t=1/1600s, F=420mm and f/6.3 (at ISO100 of course).
These settings had already proved very useful for everything "sun" with my "terrestrial" photography setup, tripod, cabled remote and solar filter foil.
Time is precious. Now, as I write this, the sky is completely cloud covered and deep grey again. Thunderstorms and strong rain ahead again ...
~ * ~
Please compare my result with
NASA's continuum photo from this same day. I also recommend SolarMonitor.org as a great and very detailed source of information about our Sun.
Camera:
- Canon EOS 7D
- unmodified
Lens:
- Canon EF 1:2.8/300mm L IS USM + Canon Extender TC 1.4x
- set to f/6.3@F=420mm
Tripod:
- Manfrotto
Task data:
- 150x1/1600s + f/6.3@F=420mm + ISO 100
- all frames RAW
Preprocessing:
- PIPP + FitsWork
Post processing:
- Darktable
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