Spectroheliograms 9th June

I LOVE finding out about different ways to appreciate the Sun and light in general. Use this forum to post your info or questions about various outside the mainstream ways to appreciate our life giving star!
Post Reply
User avatar
Alun_H
Almost There...
Almost There...
Posts: 535
Joined: Wed Apr 20, 2022 10:26 pm
Location: Berkshire UK
Has thanked: 648 times
Been thanked: 622 times

Spectroheliograms 9th June

Post by Alun_H »

Using my Evostar 72ED with full aperture Hoya Pro ND16 filter,Sol'Ex/QHY5III 178M and EQ6 Pro/EQMOD to run off a few scans in the CaK and Hydrogen alpha lines (also did a Helium but yet to process). CaK image is a stack of 9 out of 12 scans and the Halpha 12 out of 15,stacked in Autostakkert and sharpened in IMPPG finishing in Photoshop CS2

Alun
cak_lapl6_ap6657_imppg.jpg
cak_lapl6_ap6657_imppg.jpg (123.52 KiB) Viewed 1135 times
ha_lapl6_ap6578_imppg.jpg
ha_lapl6_ap6578_imppg.jpg (533.5 KiB) Viewed 1135 times
ha_lapl6_ap6578_imppg-invert.jpg
ha_lapl6_ap6578_imppg-invert.jpg (536.17 KiB) Viewed 1135 times


Lunt 50THa solar scope
Lunt CaK B12 module
SW Evostar 72ED for full disk imaging
Sol'Ex SHG
80mm f/7 achromat used with pressure tune module off the Lunt with Lunt 100mm ERF
Bresser 90 f/10 achromat used for CaK & white light imaging & PST mod with Lunt 100mm ERF
Coronado SM40 (pre Meade) and BF10 filter set + SMII 60 richview DS etalon
Skywatcher EQ6 Pro and Ioptron CEM60
Then there is all the night kit which is far too long a list to write up here! :lol:
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
thesmiths
Almost There...
Almost There...
Posts: 1054
Joined: Mon Jun 04, 2012 8:13 pm
Location: London, England
Has thanked: 42 times
Been thanked: 1487 times

Re: Spectroheliograms 9th June

Post by thesmiths »

The H-alpha turned out very well. I don't think you can get much better with 72mm aperture. I like the gentle processing.

The CaK looks like it was more difficult to process. Do you think it's focusing? Or the telescope itself? It is a pretty short focal ratio assuming you used it wide open.


User avatar
rsfoto
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 6161
Joined: Mon Jun 18, 2012 8:30 pm
Location: San Luis Potosi, México
Has thanked: 9411 times
Been thanked: 5572 times

Re: Spectroheliograms 9th June

Post by rsfoto »

Hi Alun,

Well done. Stretching a bit the midtones (from 1.0 to 2.0) in PS, brightens it a bit without burning details.

Alun_Ca-10062023.jpg
Alun_Ca-10062023.jpg (113.88 KiB) Viewed 1101 times
Last edited by rsfoto on Sun Jun 11, 2023 3:50 pm, edited 1 time in total.


regards Rainer

Observatorio Real de 14
San Luis Potosi Mexico

North 22° West 101°
User avatar
Alun_H
Almost There...
Almost There...
Posts: 535
Joined: Wed Apr 20, 2022 10:26 pm
Location: Berkshire UK
Has thanked: 648 times
Been thanked: 622 times

Re: Spectroheliograms 9th June

Post by Alun_H »

thesmiths wrote: Sat Jun 10, 2023 8:50 pm The CaK looks like it was more difficult to process. Do you think it's focusing? Or the telescope itself? It is a pretty short focal ratio assuming you used it wide open.
Thank you Douglas,I did omit mentioning I had reduced the aperture to 50mm for the CaK :roll: ,maybe should have gone further though with a 40mm to bring the scope nearer f/10. In regards the processing I have been spending more time with IMPPG rather than Astrosurface and I must say it is growing on me.

Thank you Rainer,each time I tried brightening the levels the detail burnt out hence my leaving the image dark as I have,your additional processing has improved it :)


Lunt 50THa solar scope
Lunt CaK B12 module
SW Evostar 72ED for full disk imaging
Sol'Ex SHG
80mm f/7 achromat used with pressure tune module off the Lunt with Lunt 100mm ERF
Bresser 90 f/10 achromat used for CaK & white light imaging & PST mod with Lunt 100mm ERF
Coronado SM40 (pre Meade) and BF10 filter set + SMII 60 richview DS etalon
Skywatcher EQ6 Pro and Ioptron CEM60
Then there is all the night kit which is far too long a list to write up here! :lol:
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
thesmiths
Almost There...
Almost There...
Posts: 1054
Joined: Mon Jun 04, 2012 8:13 pm
Location: London, England
Has thanked: 42 times
Been thanked: 1487 times

Re: Spectroheliograms 9th June

Post by thesmiths »

Alun_H wrote: Sat Jun 10, 2023 9:32 pm I did omit mentioning I had reduced the aperture to 50mm for the CaK :roll: , maybe should have gone further though with a 40mm to bring the scope nearer f/10.
I have a CaK PST (a wonderful scope if you can still find one) and it is 40mm f/10. It has a very nice filter, better I think than what Lunt makes these days. I think bandwidth and optics matter more than aperture for CaK.


ChrisHalpha2017
Ohhhhhh My!
Ohhhhhh My!
Posts: 173
Joined: Mon May 02, 2022 1:19 pm
Has thanked: 259 times
Been thanked: 237 times

Re: Spectroheliograms 9th June

Post by ChrisHalpha2017 »

Have you tried refocusing the collimator for the H and K line ? For better precision the collimator should be reset each time you change the wavelength (the same way you do when you refocus the sun image on the slit when you go from H alpha to H or K line.


spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
User avatar
Montana
Librarian
Librarian
Posts: 34563
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK
Has thanked: 17672 times
Been thanked: 8791 times

Re: Spectroheliograms 9th June

Post by Montana »

Fantastic work :bow :hamster: I think Rainer needs to give us all a tutorial on how to process CaK without burning the details, it's hard ;)

Alexandra


Post Reply