AR12724/25 remnants at high res 280mm C11

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Valery
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AR12724/25 remnants at high res 280mm C11

Post by Valery » Sat Oct 20, 2018 3:29 pm

Hi all,

Here are two photos of AR 2724 and 2725 remnants. No spots in them now. However they looks fine in
C11 280mm telescope.

I used two etalons. 1. Quark Chromosphere with FWHM <0.25A may be near 0,2A. and the second one is my best
selected PST etalon worked in a telecentric scheme. Quark worked at F/43 and the PST worked at F/D>50 both with
a followed focal reducer at around 0,65x.

You can see that a proper telecentric system works fine with a good airspaced etalon. I personally can't see any significant
diffeernce between these two systems, while a theory tells us that an airspaced etalon works in a telecentric configuration
far not as good as a spaced etalon. We can see that this is not always the case.
Thanks for looking.


Valery
Attachments
Oct-19-2018-UT7h-21m-C11-ARIES-295mm-DERF-PST.jpg
Oct-19-2018-UT7h-21m-C11-ARIES-295mm-DERF-PST.jpg (486.93 KiB) Viewed 276 times
Oct-19-2018-UT8h-12m-C11-ARIES-295mm-DERF-QUARK.jpg
Oct-19-2018-UT8h-12m-C11-ARIES-295mm-DERF-QUARK.jpg (494.35 KiB) Viewed 276 times
Last edited by Valery on Sun Oct 21, 2018 12:11 am, edited 2 times in total.
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Re: AR12724/25 remnants at high res 280mm C11

Post by MalVeauX » Sat Oct 20, 2018 3:54 pm

Great resolution!

Very best,

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Re: AR12724/25 remnants at high res 280mm C11

Post by Valery » Sun Oct 21, 2018 12:01 am

MalVeauX wrote:
Sat Oct 20, 2018 3:54 pm
Great resolution!

Very best,
Thanks, Marty. You may be not believe, but this given post at least for 50% was targetted for you. This is where you can be with your 10" Meade or better with a C11, which are very cheap and powerfull enough and are better solutions for lunar and planetary lucky imaging than what you can do with a 6" refractor or an 8" SCT even if it HD version. There is no substitution for an aperture.


Valery
Last edited by Valery on Sun Oct 21, 2018 12:41 pm, edited 1 time in total.
"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: AR12724/25 remnants at high res 280mm C11

Post by MalVeauX » Sun Oct 21, 2018 10:08 am

Valery wrote:
Sun Oct 21, 2018 12:01 am
MalVeauX wrote:
Sat Oct 20, 2018 3:54 pm
Great resolution!

Very best,
Thanks, Marty. You may be not believe, but this given post at least for 50% was targetted for you. This is where you can be with your 10" Meade or better with a C11, which are very cheap and powerfull enough and are better olutions for lunar and planetary lucky imaging than what you can do with a 6" refractor or an 8" SCT even if it HD version. There is no substitution for an aperture.


Valery
I'm saving towards it. I think my 10" is not worth using for this, it's just too old of a scope (30+ years old). And to get another big scope and use smaller scopes with it, I'd have to get a new mount and everything too. I'm using the 6" refractor right now just because I have it, and the ERF I'm using is a loaner. Saving towards an 8" ERF. While I'd love to have a bigger scope and bigger ERF, I have to be realistic with budget since I really want a three scope setup that is permanent in my observatory (big aperture scope, small achromat for white light, CaK full disc and a double stacked smaller HA scope). I'll probably end up with a C8 Edge. Soon!

Very best,

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Re: AR12724/25 remnants at high res 280mm C11

Post by Valery » Sun Oct 21, 2018 12:44 pm

My C11 is very old and of average optical quality. With a powerful deconvolution software we all use, a telescope can be of very middle quality.
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Re: AR12724/25 remnants at high res 280mm C11

Post by MalVeauX » Sun Oct 21, 2018 3:18 pm

How is the transmission when you double stack the PST etalon & the Quark together? Do you prefer single stack for surface imaging like this?

Very best,

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Re: AR12724/25 remnants at high res 280mm C11

Post by marktownley » Sun Oct 21, 2018 8:28 pm

Great close ups Valery and good demonstration of what is possible. I wish my seeing conditions supported such aperture.
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Re: AR12724/25 remnants at high res 280mm C11

Post by MapleRidge » Sun Oct 21, 2018 10:19 pm

Hi Valery...

These show an amazing amount of detail with the narrow band-pass and large aperture. Excellent work :bow

Brian
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Re: AR12724/25 remnants at high res 280mm C11

Post by Valery » Mon Oct 22, 2018 2:46 am

MalVeauX wrote:
Sun Oct 21, 2018 3:18 pm
How is the transmission when you double stack the PST etalon & the Quark together? Do you prefer single stack for surface imaging like this?

Very best,
The transmission in such a combination is mostly defined by transmission in:

1. Blocking filter - can be vary up to 2x !
2. Quark and PST etalon transmission. Can vary up to 3x!

So, a telescope is the last and the least factor in transmission.

When image active areas, especially with large spots and spiculaes and prominences at the limb I prefer a narrow single stacked etalon like my best Quark and my best PST etalon.

For imaging of "desert" areas, dark filaments, prominences near limb, some smaller spots I prefer a double stacked combination.


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: AR12724/25 remnants at high res 280mm C11

Post by Montana » Mon Oct 22, 2018 11:36 am

These are lovely images Valery :hamster: :bow
Alexandra

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Re: AR12724/25 remnants at high res 280mm C11

Post by Carbon60 » Mon Oct 22, 2018 6:21 pm

Super images, as usual, Valery.

Stu
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