Ca K image taken with the TOA 150 on April 22nd
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Ca K image taken with the TOA 150 on April 22nd
Hi,
This test image was taken with only fair resolution. There was some activity next to the sunspot :
Christian
This test image was taken with only fair resolution. There was some activity next to the sunspot :
Christian
Christian Viladrich
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Re: Ca K image taken with the TOA 150 on April 22nd
An excellent CaK image Christian...great details
Brian
Brian
Brian Colville
Maple Ridge Observatory
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Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
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
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
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Re: Ca K image taken with the TOA 150 on April 22nd
Christian,
This image is nearly as good as the images from April 25. The seeing here, Apr 22 is almost as good for a 6" aperture as it was later Apr 25.
For larger apertures the difference will be much more significant.
And I believe that finesse of your Barr (Materion) CaK filter is much higher than any CaK filter I ever saw (images) among amateurs. And this your filter is perfectly at the center of the CaK band. Not so with other filters. This can be seen how the supergranulation cells look like at your omages and at other images.
Valery
This image is nearly as good as the images from April 25. The seeing here, Apr 22 is almost as good for a 6" aperture as it was later Apr 25.
For larger apertures the difference will be much more significant.
And I believe that finesse of your Barr (Materion) CaK filter is much higher than any CaK filter I ever saw (images) among amateurs. And this your filter is perfectly at the center of the CaK band. Not so with other filters. This can be seen how the supergranulation cells look like at your omages and at other images.
Valery
Last edited by Valery on Fri Apr 27, 2018 11:47 pm, edited 1 time in total.
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Re: Ca K image taken with the TOA 150 on April 22nd
Another brilliant image Christian.
I agree Valery about the filter being dead centre line.
I agree Valery about the filter being dead centre line.
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Re: Ca K image taken with the TOA 150 on April 22nd
Superb image, Christian.
Stu.
Stu.
H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: Ca K image taken with the TOA 150 on April 22nd
Thanks to all :-)
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
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Co-author of "Planetary Astronomy"
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Editor of "Solar Astronomy"
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Re: Ca K image taken with the TOA 150 on April 22nd
Fantastic resolution Christian
Pedro Re'
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Re: Ca K image taken with the TOA 150 on April 22nd
Thanks Pedro and Eric !
Christian Viladrich
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Re: Ca K image taken with the TOA 150 on April 22nd
Hi Christian, you use the TOA very effectively here for your CaK images; are there any other scopes you have used previously that you would rate for Ca work? Thanks, Mark.
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Re: Ca K image taken with the TOA 150 on April 22nd
Hi Mark,
As you know, the problem with refractors is the spherical aberration in UV.
I have only used three refractors since I started Ca K imaging 18 years ago (time is flying ...).
- Vixen 55 mmF/8 Fluo: I started with that one.
- Taka FSQ 106 F/5 (first version ) : when I moved to the FSQ, I realized that the Vixen 55 F/8 Fluo had a huge sperical aberration in UV. When the FSQ was stopped down to 55 mm, the Ca K images were much better than with the Vixen 55 F/8 Fluo.
But ... the FSQ could not give good Ca K images at full aperture. It had to be stopped down to 80 mm or lower.
- TOA 150 : is excellent in Ca K even at full aperture. The spot diagram at 396 nm also says so ...The only limit is that the coating absorbs about 50% of the light in Ca K (for the total of the three lenses). Taka was OK to coat a lens for Ca K, but ...it meant a lot of € again.
What is nice is that a 150 nm aperture at 396 nm has the same resolution as a 250 mm aperture at 656 nm :-)
This being said... the most difficult part is to find the spherochromatism data in UV light for the various refractors available. So I am afraid I can help much :-(
I remember a post on CN describing an optical design for a refractor optimised for Ca K (two lens). This could be a way.
Another way could be to go for a 150 mm F/7 Newtonian with a coated mirror. A 50 mm Astronomik blue filter placed in front of the secondary mirror could play the role of an internal ERF. This might be the best overall option for HR Ca K imaging.
As you know, the problem with refractors is the spherical aberration in UV.
I have only used three refractors since I started Ca K imaging 18 years ago (time is flying ...).
- Vixen 55 mmF/8 Fluo: I started with that one.
- Taka FSQ 106 F/5 (first version ) : when I moved to the FSQ, I realized that the Vixen 55 F/8 Fluo had a huge sperical aberration in UV. When the FSQ was stopped down to 55 mm, the Ca K images were much better than with the Vixen 55 F/8 Fluo.
But ... the FSQ could not give good Ca K images at full aperture. It had to be stopped down to 80 mm or lower.
- TOA 150 : is excellent in Ca K even at full aperture. The spot diagram at 396 nm also says so ...The only limit is that the coating absorbs about 50% of the light in Ca K (for the total of the three lenses). Taka was OK to coat a lens for Ca K, but ...it meant a lot of € again.
What is nice is that a 150 nm aperture at 396 nm has the same resolution as a 250 mm aperture at 656 nm :-)
This being said... the most difficult part is to find the spherochromatism data in UV light for the various refractors available. So I am afraid I can help much :-(
I remember a post on CN describing an optical design for a refractor optimised for Ca K (two lens). This could be a way.
Another way could be to go for a 150 mm F/7 Newtonian with a coated mirror. A 50 mm Astronomik blue filter placed in front of the secondary mirror could play the role of an internal ERF. This might be the best overall option for HR Ca K imaging.
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 image taken with the TOA 150 on April 22nd
Thanks Christian, that's useful info. I've tried a handful of scopes too, and like yourself found SA is a pain. Finding a nice CaK scope is on my bucket list. If cost was no object i'd possibly go for the TOA130. Not sure how often my seeing would let me get much more than that aperture wise.
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