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Moving forward from solar cycle 24 to 25

A big solar newton for ultra narrowband imaging, possible?

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christian viladrich
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Re: A big solar newton for ultra narrowband imaging, possible?

Post by christian viladrich » Sun Sep 15, 2019 11:23 am

Hello langleif2,
This is a textbook example of loss of information in a communication process : A tells a story to B, which B repeats it to C, etc. After a short while the story becomes quite another story :-)

So here the actual story :
Every year, we have a solar gathering at Serbannes (France). New stuff are presented, either homemade or commercial. 80 - 100 people attend this gathering, and we are happy to welcome some German solar nuts too.

For example, I remember having look through a vintage Zeiss Meniscas 180 mm equipped with a Lunt 50 mm etalon. It was quite good. This year, we were honored to have Oliver (Beloptik) with some other German friends.

In 2016 and 2017, Fred Jabet (AiryLab) presented his 11" Hat with an ERF coated Schmidt plate. It was indeed through this instrument that "Fensterrollo" looked though, not a 300 mm.
Here is one of the images I took with this telescope. The solar activity was much more exciting than now :
http://astrosurf.com/viladrich/astro/so ... 3A-F27.jpg

The 250 mm Newtonian telescope equiped with an ERF mirror you are refering too was the one of Alexandre.

The ERF coating of Alexandre's mirror and of the Schmidt plate of the Hat was done by MCM, and no missile stuff ;-)

Here is the website of the ROS. I think there is a link somewhere to the presentations:

https://www.soleilactivites.fr/

Best regards
Christian Viladrich
Co-author of "Astronomie Planétaire"
http://www.astroplanetes.com/
Co-author of "Astronomie Solaire"
http://www.astronomiesolaire.com/

christian viladrich
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Re: A big solar newton for ultra narrowband imaging, possible?

Post by christian viladrich » Sun Sep 15, 2019 11:24 am

I also have the TS concenter. It is indeed quite good to align the secondary mirror of the 300 mm solar Newtonian.
Christian Viladrich
Co-author of "Astronomie Planétaire"
http://www.astroplanetes.com/
Co-author of "Astronomie Solaire"
http://www.astronomiesolaire.com/

bart1805
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Re: A big solar newton for ultra narrowband imaging, possible?

Post by bart1805 » Sun Sep 15, 2019 12:16 pm

allhoest wrote:
Wed Sep 11, 2019 6:11 pm
I use the Concentrer to prepare the collimation, for centering the secondary.
But for finishing the collimation, the Concentrer requires the central spot and dark conditions:
http://www.spheretec.de/pdf/Collimating ... epiece.pdf

When there is not central spot, then star test is the natural option to go.
As alternative, maybe the goldfocus solution may help; I didn't evaluate it however.
http://www.goldastro.com/

CS
Alex
Hi Alex, after I de-aluminized my 150mm mirror, I marked the central spot. With the center spot I could use the concenter to collimate both the primary and secondary.

allhoest
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Re: A big solar newton for ultra narrowband imaging, possible?

Post by allhoest » Wed Sep 25, 2019 5:00 pm

Hi Bart.
I use to collimate during the day at the location where I travel to.
Can you collimate with the concentrer under daylight?
CS
Alex

bart1805
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Re: A big solar newton for ultra narrowband imaging, possible?

Post by bart1805 » Fri Sep 27, 2019 7:20 am

allhoest wrote:
Wed Sep 25, 2019 5:00 pm
Hi Bart.
I use to collimate during the day at the location where I travel to.
Can you collimate with the concentrer under daylight?
CS
Alex
Hi Alex,
Yes, that is no problem. Could the difference be that my telescope is a closed tube?
CS, Bart.

langleif2
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Re: A big solar newton for ultra narrowband imaging, possible?

Post by langleif2 » Fri Sep 27, 2019 1:17 pm

christian viladrich wrote:
Sun Sep 15, 2019 11:23 am
Hello langleif2,
This is a textbook example of loss of information in a communication process : A tells a story to B, which B repeats it to C, etc. After a short while the story becomes quite another story :-)

So here the actual story :
Every year, we have a solar gathering at Serbannes (France). New stuff are presented, either homemade or commercial. 80 - 100 people attend this gathering, and we are happy to welcome some German solar nuts too.

For example, I remember having look through a vintage Zeiss Meniscas 180 mm equipped with a Lunt 50 mm etalon. It was quite good. This year, we were honored to have Oliver (Beloptik) with some other German friends.

In 2016 and 2017, Fred Jabet (AiryLab) presented his 11" Hat with an ERF coated Schmidt plate. It was indeed through this instrument that "Fensterrollo" looked though, not a 300 mm.
Here is one of the images I took with this telescope. The solar activity was much more exciting than now :
http://astrosurf.com/viladrich/astro/so ... 3A-F27.jpg

The 250 mm Newtonian telescope equiped with an ERF mirror you are refering too was the one of Alexandre.

The ERF coating of Alexandre's mirror and of the Schmidt plate of the Hat was done by MCM, and no missile stuff ;-)

Here is the website of the ROS. I think there is a link somewhere to the presentations:

https://www.soleilactivites.fr/

Best regards
Oh my Lord. What a picture that is. :bow I actually write with Oliver from time to time and this time he was on his way to the star party. It was hard to convince him about the severe spherochromatism in a SCT. It should only be 1/4 wave overcorrected from 550nm. So he couldn't believe the graph. Then I presented him my pictures with and without a modified barlow and it was going from myopia to wearing glasses like the Hubble telescope.

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