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Belated Ca K full-disk images taken on Sept 9, 24 and 25

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#1 ch-viladrich

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Posted 08 December 2023 - 09:00 AM

Here is a set of images taken in Ca K on September 9, 24 and 25.

 

The first one was a mistake...I forget to put the 75 mm aperture stop on the Taka TOA 150. So, the f-ratio was f/7.3, instead of f/14.6, which resulted in a great loss on contrast. Still, it illustrates the change of FWHM with the f-ratio :

http://astrosurf.com...aK-DS-1A-f7.jpg

The same day with the 75 mm aperture stop :
http://astrosurf.com...K-DS-1A-f15.jpg
A filament is visible on the east.

 

Sept 24th, the seeing was not great :

http://astrosurf.com...r-CaK-DS-1A.jpg
 

Sept 25th, first in single-stack :

http://astrosurf.com...r-CaK-1A-SS.jpg
 

and in double-stack :

http://astrosurf.com...r-CaK-1A-DS.jpg

 

Clear skies !

Christian


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#2 MalVeauX

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Posted 08 December 2023 - 09:12 AM

Wow, I see some filaments in your double stacks... wild!

 

Very best,


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#3 rigel123

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Posted 08 December 2023 - 10:44 AM

Excellent Christian!


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#4 BYoesle

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Posted 08 December 2023 - 12:12 PM

Thanks for posting these Christian - excellent presentations of f ratio and double stacking effects for narrow band imaging. waytogo.gif




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