CaK Full Disk and Post Flare Loops x2 15th May

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CaK Full Disk and Post Flare Loops x2 15th May

Post by marktownley »

Hi All.

Wednesday was a good day - the usual mid week meeting at the end of the day was cancelled and from being grey and rainy in the morning clear blue skies with great transparency prevailed. I was not hanging aroundand got home as quick as I could.

Long story short, I have eliminated all reflections in my double stack CaK filter, and now the way I tune it is by ramping the exposure up to 30ms and tuning until the proms are most pronounced. Imagine my surprise when I did this and saw post flare loops on both sides of the sun. A first for me, two at once, and another first, in CaK.

Anyway, here they are, taken 40mm f15 with the zwo183.

ImageCaK FD 40mm f15 zwo183mm by Mark Townley, on Flickr

ImageCaK FD 40mm f15 zwo183mm colour by Mark Townley, on Flickr

Both viewed best in Flickr.

Hope you like

Mark


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by solar »

That is great imaging Mark. Beautiful limb and prominences details.
I would not have thought of double stacking Cal K.
I have a Lunt 1200 Module but have not used it for a long time.
Do you have a stand alone Cal K scope with a module in the rear?


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by Peterm »

Really amazing detail in those loops Mark.


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by Rob63 »

That's outstanding Mark, a really fantastic sight and pushing the boundaries of amateur Ca-K imaging.
I take it when you say tuning you are talking about tilting one of the filters?


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by Carbon60 »

Your dogged determination to refine and refine your calcium setup has really paid off, Mark. This result is superb.
The Sun has rewarded your efforts by putting on a beautiful display :)

Thank you for revealing to us the art of the possible.

Stu.


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by SolarMathmo »

Super disc and flares - really inspires me to get a grip on CaK. Could be a while.


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by robert »

Astonishing to see detailed prominences in CaK
Wow!
Robert


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by ffellah »

Congratulations on achieving this, Mark. The images are superb, amazing detail in the loops.

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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by pupak »

Supebr CaK pictures, Mark.
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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by vineyard »

Those are great. The proms are so clear and crisp. The colourised one is my preferred option here b/c I think it makes the proms stand out more vividly.


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by DeepSolar64 »

WoW Mark. You imaged those loops in CaK. Outstanding! I hope you don’t mind me saving them for future reference. Your credits included of course.

SPOD recommended!!

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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by MAURITS »

These calcium images are TOP Mark.


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by pdmphoton »

Mark,
The results of your efforts and the dedication to your craft has truly produced inspiring, detailed images in the CaK wavelength.
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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by rsfoto »

Excellent


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by marktownley »

Thanks everyone for your kind words, I feel humbled.

To answer questions.

I have many scopes (so Mrs Townley tells me), and over time some have definitely migrated into CaK dedicated scopes - the ED80 (stopped to f15) I use for the full disks is very well corrected when stopped down and also high transparency. The 100mm Russian TaL and 127mm Bresser are also excellent, all are used stopped down. IMHO these cheap achromats at CaK perform better than my significantly more expensive LZOS 100/800 - more glass = less light and longer exposure time - not good in CaK.

The CaK module is of my own making, it uses an Alluxa and Chroma CaK filter. Both filters are tilted tuned; the primary filter (closest to the objective) is the Alluxa and this requires only a small amount of tilt to be on band. The secondary filter (closest to the camera) is tilted to be tuned and also throw the reflection away from the disk, as with an external double stack Ha setup. I had experimented with CaK PST filters in the setup, and while these hit the target specification of the filter better than the Alluxa or Chroma, it means they perform better with less tilt, and as such the ghost image is not thrown away from the disk when I use them double stacked. You also get some weird interference patterns. So the benefits of slightly tighter bandpass are negated by ghosting.

Once the ghost disk is thrown away from the 'actual' disk, and coupled with good sky transparency, the proms are easy, they are buried in the last couple of bits of data in the shadows, and require post processing to draw them out, but no different than with a DS Ha setup. Other key is out of band blocking, the more the better. The aim is for as good a signal to noise ratio as possible.

There is more to get out of the system yet - the mechanics of it all are cobbled together out of old extension tubes, filter holders and noses from barlows (minus the lenses). There is baffling and also blacking / flocking of the mechanics which will eek a bit more out. An iterative approach is the way forward.

Despite being imaged at f15 for full disk i'm getting an exposure time of 3ms, and even when I barlow up for closeups I'm keeping below 6ms with minimal gain. I'm very much looking forward to seeing how it compares against the new solar spectrum CaK etalons, I have a feeling I will have a lot more light to play with ;)

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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by DeepSolar64 »

Mark,
How well does your homebuilt CaK filter do against a Lunt CaK module? I think yours probably has better contrast and shows the proms better. But I have never owned a Lunt module and am going by the images I see posted here.

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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by marktownley »

DeepSolar64 wrote: Thu May 16, 2024 5:00 pm How well does your homebuilt CaK filter do against a Lunt CaK module? I think yours probably has better contrast and shows the proms better. But I have never owned a Lunt module and am going by the images I see posted here.
The contrast is significantly higher and the proms much easier, i've played with a few Lunts over the years. The main difference is that it is tunable to get it on band. The lunts are governed by what the CWL of the module is (not necessarily on 393nm) and there is no way to tune them (easily!)


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by Dennis »

Great FD Mark!
And i agree, light throughput is very important in this wavelengths to maximize chances of good results.


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by KMH »

That's a superb images! As others said, your hard work on advancing the state of Ca imaging really shows.
May I ask specifically what filters you're using? Do you use the RAF tilt tuner?

Thanks!
Kevin


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by DavidP »

Congratulations Mark . These are amazing!
You really captured these prom loops going and coming. I’ve not seen anything like that in calcium


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by marktownley »

KMH wrote: Thu May 16, 2024 6:29 pm May I ask specifically what filters you're using? Do you use the RAF tilt tuner?
Hi Kevin. It is a 1a Alluxa and a 1a Chroma, in reality both are wider than that though. Yes, I do use the RAF tilt tuner on the secondary filter to throw the reflection, it is too crude for the primary filter, for that I use the skybender filter tilter, it is considerably better in it's ability to accurately and repeatedly tune these filters. I modded the raf tilter, the brass thumbsrew that comes as standard adjusts the tilt when you screw it down so I replaced it with a lock nut.


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by Albireo »

Awesome full disks Mark!
I really like that there's post flare loops on both sides :)


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by VasilevIvan »

The finest tuning of CaK scope, Mark! Incredible FD's in CaK! Its really good luck to captured flare loops from both sides of the limb.


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by zhouQin »

Beautiful images!


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by LeoD »

Fine tuning and excellent result!
Thanks, Mark, it's definitely worth trying in the same way.
Loops are amazing!


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by Martin_S »

Great Imaging Mark. Thank you for the supplementary information on your setup. I had a Lunt b1200 Cak module but I could never get decent results , I don't know if it was inexperience or poor seeing conditions, so I sold it.

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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by Petrus »

Fantastic result Mark, I love the flare loops, getting them on CaK is even better.


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by nicspenceryork »

These images are a delight to see. Wow!
Always grateful that you take the time to describe the kit and your next intentions to help us understand more about why it works in the way it does.
Fascinating!
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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by marktownley »

Thanks everyone, way too much haze this morning for any serious proms in CaK.


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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by Ivan »

Congratulations, Mark! Very impressive!

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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by DeepSolar64 »

Mark,
Congratulations on the SPOD!! :bow

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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by MapleRidge »

Hi Mark...

These CaK images are absolutely incredible...you always get great images but the post flare loops really show the capability of your system.

Well done :bow

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Re: CaK Full Disk and Post Flare Loops x2 15th May

Post by TareqPhoto »

First, congratulations for SPoD, well deserved!!!

Second, sorry for late reply to this.

Third, forth, tenth and last, i barely started with single stack CaK and you already double stacking it? Oh my, i have to give up solar before i even go much further, i can't match or compete with any of you here even with our super excellent nice seeing in my area :D ;)

Can you send me one filter you made to use with my CaK? :lol: :mrgreen:


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