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
Spectroheliograms 9th June
- Alun_H
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Spectroheliograms 9th June
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!
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
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!
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
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Re: Spectroheliograms 9th June
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.
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.
- rsfoto
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Re: Spectroheliograms 9th June
Hi Alun,
Well done. Stretching a bit the midtones (from 1.0 to 2.0) in PS, brightens it a bit without burning details.
Well done. Stretching a bit the midtones (from 1.0 to 2.0) in PS, brightens it a bit without burning details.
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°
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
- Alun_H
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Re: Spectroheliograms 9th June
Thank you Douglas,I did omit mentioning I had reduced the aperture to 50mm for the CaK ,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!
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
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!
More images on view on my Flickr page...https://www.flickr.com/photos/alun_h/
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Re: Spectroheliograms 9th June
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.
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Re: Spectroheliograms 9th June
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
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Re: Spectroheliograms 9th June
Fantastic work I think Rainer needs to give us all a tutorial on how to process CaK without burning the details, it's hard
Alexandra
Alexandra