Ca K solar disk image, March 25, single and double stack - ASI1600
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Ca K solar disk image, March 25, single and double stack - ASI1600
Hi,
This is my first solar images of the season and the first light of my ASI 1600.
Here is the single stack image :
http://www.astrosurf.com/viladrich/astr ... SI1600.jpg
And the double stack image :
http://www.astrosurf.com/viladrich/astr ... SI1600.jpg
By comparison, the single stack image looks a bit "flat".
Best regards
Christian
This is my first solar images of the season and the first light of my ASI 1600.
Here is the single stack image :
http://www.astrosurf.com/viladrich/astr ... SI1600.jpg
And the double stack image :
http://www.astrosurf.com/viladrich/astr ... SI1600.jpg
By comparison, the single stack image looks a bit "flat".
Best regards
Christian
Christian Viladrich
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http://planetary-astronomy.com/
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Lovely full disc's Christian.
The DS is clearly superior to the SS...
The DS is clearly superior to the SS...
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Christian:
Super FD´s, but the DS is superior.
Best regards.
Eric.
Super FD´s, but the DS is superior.
Best regards.
Eric.
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Hi Christian,
Excellent and huge discs. What is the focal length ?
Excellent and huge discs. What is the focal length ?
regards Rainer
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Superb!! I too vote for the double stack
Alexandra
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Thanks to all :-)
Yes indeed, the double stack is clearly better. I was a little bit surprise by this diffence since the Alluxa filter is 0.40 nm FWHM (and not 0.44 nm). This is probably because it is a multi-cavity filter. The exposure time is still reasonnable thanks to the UV sensitivity of the ASI 1600.
The image is taken at the native focus of the TOA 1500 (about 1100 mm). The sensor and pixel sizes are perfect. No need for mosaic. This is just one-shot picture (with a stack of 7 frames).
Next step is triple stacking, just like Pedro in Ha ... No, just joking ;-)
Yes indeed, the double stack is clearly better. I was a little bit surprise by this diffence since the Alluxa filter is 0.40 nm FWHM (and not 0.44 nm). This is probably because it is a multi-cavity filter. The exposure time is still reasonnable thanks to the UV sensitivity of the ASI 1600.
The image is taken at the native focus of the TOA 1500 (about 1100 mm). The sensor and pixel sizes are perfect. No need for mosaic. This is just one-shot picture (with a stack of 7 frames).
Next step is triple stacking, just like Pedro in Ha ... No, just joking ;-)
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Beautiful results, Christian. The DS is better but the SS is excellent too.
Franco
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
I would be very happy of such a flatness in my CaK discs....christian viladrich wrote: ↑Thu Mar 25, 2021 8:58 pmBy comparison, the single stack image looks a bit "flat".
Raf
My solar images and reports with articles on solar equipment
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
These are superb Christian
The single stack looks fabulous and would be impressive on its own...now the DS version is a step beyond!!!
Brian
The single stack looks fabulous and would be impressive on its own...now the DS version is a step beyond!!!
Brian
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Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
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Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM
2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
I'd give it a shot Christian !-)Next step is triple stacking, just like Pedro in Ha ... No, just joking ;-)
Diagonally parked in a parallel universe.
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Thanks Franco, Brian, Raf and Maurits :-)
Christian Viladrich
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Hi Bob, I remember that one. It was quite a teaser for us :-)Bob Yoesle wrote: ↑Sat Mar 27, 2021 11:00 amI'd give it a shot Christian !-)Next step is triple stacking, just like Pedro in Ha ... No, just joking ;-)
BTW, I checked the transmission profiles of the Barr and Alluxa filters : the Barr filter is a two-cavity filter while the Alluxa filter is a three-cavity. This would be equivalent to a five-stacked system is the FWHM of both filters was similar.
Christian Viladrich
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http://planetary-astronomy.com/
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Pretty cool Christian. Any chance you can get a hold of a Coronado PST and/or Lunt CaK filters to see what they look like? The only thing I've ever seen regarding them (I assume they are very similar) is shown below, and it's not too informative:
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Very nice disks Christian. Have you experimented with tilting the filters in the DS? Your images are hinting at the spicule rings, i've found this is what 'pops out' when the tuning of the filters is spot on.
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Re: Ca K solar disk image, March 25, single and double stack - ASI1600
Hello Mark,
The EO394 is mounted in a tilt-system. Tilting this filter is only for rejecting reflexions away from the main image.
The Alluxa filter is mounted in another tilt-system. The setting of the tilting is relatively straigtforward. The idea is to minimize banding.
Prominences are very faint, so there are not very usefull in my case, but this is certainly a good idea in other cases.
The Barr filter is a bit shifted to the blue, so no need to tilt it.
Just for the fun, here is what the chromospheric fringe looks like :
http://astrosurf.com/viladrich/astro/so ... 00-ddp.jpg
It a bit tricky with this configuration to display the disk and the prominences on the same image .
The EO394 is mounted in a tilt-system. Tilting this filter is only for rejecting reflexions away from the main image.
The Alluxa filter is mounted in another tilt-system. The setting of the tilting is relatively straigtforward. The idea is to minimize banding.
Prominences are very faint, so there are not very usefull in my case, but this is certainly a good idea in other cases.
The Barr filter is a bit shifted to the blue, so no need to tilt it.
Just for the fun, here is what the chromospheric fringe looks like :
http://astrosurf.com/viladrich/astro/so ... 00-ddp.jpg
It a bit tricky with this configuration to display the disk and the prominences on the same image .
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/