Trying to suppress the parasitic light (using a 80a filter which was available) not too much success, but the SHG image cleaned up well and shows the filaments clearly.
I took a couple of images with the DIY CaK filter (Vixen 90/1000) for comparison - no ( easy) filaments visible, maybe a shadow - what do you think??!
Enjoy.
CaK filaments - MiniSHG 22 Nov2021
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CaK filaments - MiniSHG 22 Nov2021
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Re: CaK filaments - MiniSHG 22 Nov2021
There are some streaks in the south with a close look in the DIY filter images that may be a glimpse of the filaments. It's hard to say for sure. The SHG picks them up with ease!!
James
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Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
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Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
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Re: CaK filaments - MiniSHG 22 Nov2021
Hi Ken
A very faint filament is visible
A very faint filament is visible
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Re: CaK filaments - MiniSHG 22 Nov2021
Yes, I can just about see hints of where the filaments would be in the DIY filter, the SHG is superb
I was looking at Eric's version, he can get superb proms but again the filament only shows a hint when you know where to look.
Alexandra
I was looking at Eric's version, he can get superb proms but again the filament only shows a hint when you know where to look.
Alexandra
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Re: CaK filaments - MiniSHG 22 Nov2021
Really excellent Ken, the SHG certainly shows the filaments well, with the filter, maybe there is a suggestion of the shadow. Please keep them coming!
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Re: CaK filaments - MiniSHG 22 Nov2021
The comparison helps understand to issue/ problem with CaK filaments.
I've tried to summarise what I've found:
viewtopic.php?f=4&t=34040
I've tried to summarise what I've found:
viewtopic.php?f=4&t=34040
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer