Finally testing new CaK filter stack

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Merlin66
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Finally testing new CaK filter stack

Post by Merlin66 » Fri Jun 22, 2018 1:43 am

I've recently upgraded the Omega (three filter) CaK stack to include a Baader CCD (Blue) filter as an ERF. I also added a SkyBender filter tilter - to bring the 2A filter closer to CWL.

Been frustrated by the weather - if not rain then thick cloud...
Well, this morning there was thin high cloud so let's give it a go. Mounted on the ED80/HEQ5, with the ASI 174MM - Success!!!!!

The video files (to be processed ASAP) clearly show the current sunspot groups and large areas of bright flocculi.

The 2" filter spacer tubes hold the Baader CCD-B well in front of the stack; inside the tube, in front of the gold SkyBender is a 390nm cut filter (acts as a secondary ERF) then about 30mm spacer to a 80nm bandwith 394nm CWL filter as a pre-filter then finally the 2A bandwidth, 393.7nm CWL mounted in the SkyBender.....

I'm impressed!!! It actually works!!!
So far so good.
Onwards and Upwards
100_3486.JPG
Arrangement of CaK filter stack
100_3486.JPG (271.53 KiB) Viewed 867 times
100_3485.JPG
CaK filter stack ASI174MM
100_3485.JPG (255.74 KiB) Viewed 867 times
100_3484.JPG
ED80 CaK stack ASI 174mm
100_3484.JPG (284.68 KiB) Viewed 867 times
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Valery
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Re: Finally testing new CaK filter stack

Post by Valery » Fri Jun 22, 2018 3:27 am

Congratulates with a new setup version! But we'd like to see the images you took with it.


Valery
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: Finally testing new CaK filter stack

Post by Merlin66 » Fri Jun 22, 2018 4:16 am

SkyBurner, yeah.... I sent you an email about this SkyBender.....
Valery,
Just processing the images - coming soon...
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: Finally testing new CaK filter stack

Post by Merlin66 » Fri Jun 22, 2018 4:40 am

This image is probably representative of my ability to focus and tune the filter stack....
Processed in AS3!, no wavelets no curves.....
CaK_112110_220618.png
CaK filter stack, ED80+ASI 174
CaK_112110_220618.png (1.6 MiB) Viewed 855 times
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: Finally testing new CaK filter stack

Post by Merlin66 » Fri Jun 22, 2018 6:09 am

A touch of colour and re-aligned axis.....
CaK_220618a.png
CaK_220618a.png (1.63 MiB) Viewed 851 times
CaK_112110_crop.png
CaK_112110_crop.png (461.2 KiB) Viewed 851 times
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: Finally testing new CaK filter stack

Post by Merlin66 » Fri Jun 22, 2018 6:29 am

I bought an ASI 183MM earlier this year to compliment the shorter focal length ED80 and "improve resolution" for solar imaging.
Cutting a looooong story very short, ZWO finally admitted "technical problems when the ASI 183 is used for narrow band solar imaging" and accepted a return.
I'm now looking seriously at the ASI 1600MM as a replacement.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Valery
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Re: Finally testing new CaK filter stack

Post by Valery » Fri Jun 22, 2018 8:55 am

Thanks, Ken, for the images.

Seems to me that a single Lunt B600 CaK is much better than this army of filters and mechanics.

May be if good filters will become available, the skybender will get a good use.


Valery
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: Finally testing new CaK filter stack

Post by Merlin66 » Fri Jun 22, 2018 9:09 am

I probably agree, but at a total price of a few hundred dollars it's much cheaper than the commercial options.....
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Valery
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Re: Finally testing new CaK filter stack

Post by Valery » Fri Jun 22, 2018 12:38 pm

I'd better pay more for a real result, than pay several hundreds backs for doubtful result.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: Finally testing new CaK filter stack

Post by marktownley » Sat Jun 23, 2018 6:54 am

Cool setup Ken and nice results!
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: Finally testing new CaK filter stack

Post by Merlin66 » Sat Jun 23, 2018 8:13 am

Thanks Mark, appreciate.
The conditions were far from ideal.
I hope to get better weather and a better camera soon.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: Finally testing new CaK filter stack

Post by marktownley » Sat Jun 23, 2018 8:53 am

Something else to try Ken, imaging at that scale for full disk reduce the aperture - say 50mm, it will be much more friendly for the seeing and also put a slower light cone into the filters and tighter bandpass giving better contrast still.
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: Finally testing new CaK filter stack

Post by Merlin66 » Sat Jun 23, 2018 9:00 am

Mark,
Thanks for the suggestion.
I’ll try it the next opportunity.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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