July 16 2022 CaK close-ups

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July 16 2022 CaK close-ups

Post by LeoD »

Hi all,
I was a bit lucky to see M-class flare on Saturday in the morning, but only through high clouds. Than I switched to Ca waylaying gaps in clouds.
I'm quite satisfied with my CaK dedicated 120mm achro with a distance between lenses 2mm, tinkering worth it. With a good seeing less than ~1" all 120mm of aperture works like 200mm in Ha.
The issue I try to solve is blurred and faded spicule layer and proms in Ca, maybe it's also due to low DR of 174 chip at 393nm.
Here are AR's: 3053, 3055, 3056, 3057, 3058, 3059.
regards
Leo
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Sun_20220716 122949_cOAIdPs AR3059.jpg (530.18 KiB) Viewed 649 times
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Sun_20220716 115916_AIPs AR3057.jpg (640.4 KiB) Viewed 649 times
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Ha&Ca
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Sun_20220716 0635 115916_AIPs AR3057 M11flare.jpg (809.68 KiB) Viewed 649 times


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Re: July 16 2022 CaK close-ups

Post by torsinadoc »

These are very good calcium images. Looks like you have a great system


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Re: July 16 2022 CaK close-ups

Post by ffellah »

I agree with Alan, great Calcium images Leo.

Franco


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Re: July 16 2022 CaK close-ups

Post by marktownley »

Love these shots Leo!

You've done some stretching of the shadows to bring them out, I don't think the issue is the dynamic range of the camera, although it may be worth trying it in 16 bit (12 bit really) mode and seeing if you get any difference - it's more the signal to noise ratio of the filter system. If you're looking to bring out the spicule layer and proms like this, to increase your chances you firstly need to be double stacking the filter and secondly both elements of the filter will need to be clocked and tilted for optimal performance.

I find the proms and spicule layer only reveal themselves fully when sky transparency is at its highest, any haze, contrails etc definitely impact. I do wonder in summer season how much NLC make an impact too.

Keep them coming!

Mark


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Re: July 16 2022 CaK close-ups

Post by MAURITS »

Excellent close-ups Leo.


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Re: July 16 2022 CaK close-ups

Post by LeoD »

Thanks for your comments, Alan, Franco and Mauruts!
Yes, Mark, in any case the main factor is seeing, which, as I remember, deteriorates about 1.2 times faster with a decrease in wavelength compared to the aperture. This time the seeing was worse in average than the previous one here viewtopic.php?t=37077 and stacking result showing a tiny granulation structure not so correct. I've seen only once fantastic spiculae forest in CaK on the screen in 300% scale with totally frozen air for a second, so I know I haven't reached the limit yet.
Of course, DS system is the next step.
regards
Leo


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Re: July 16 2022 CaK close-ups

Post by Montana »

Wow!! these are wonderful and great to see the flare :bow :hamster:

Alexandra


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Re: July 16 2022 CaK close-ups

Post by marktownley »

LeoD wrote: Wed Jul 20, 2022 7:17 am Yes, Mark, in any case the main factor is seeing, which, as I remember, deteriorates about 1.2 times faster with a decrease in wavelength compared to the aperture. This time the seeing was worse in average than the previous one here viewtopic.php?t=37077 and stacking result showing a tiny granulation structure not so correct. I've seen only once fantastic spiculae forest in CaK on the screen in 300% scale with totally frozen air for a second, so I know I haven't reached the limit yet.
Of course, DS system is the next step.
regards
Leo
For CaK spicules, IMHO, it is transparency, not seeing, I can get CaK spicules quite easily at 60mm aperture when the transparency is excellent. If the transparency is not there, then the image has less contrast and a lower signal to noise ratio making the low contrast spicules much harder to see, regardless of increase in aperture.

The other factor is spherical aberration at 393nm, but you have that sorted with the spaced objective lens. :)


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Re: July 16 2022 CaK close-ups

Post by allhoest »

Super CaK work!
CS
Alex


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Re: July 16 2022 CaK close-ups

Post by LeoD »

marktownley wrote: Wed Jul 20, 2022 7:52 pm
For CaK spicules, IMHO, it is transparency, not seeing, I can get CaK spicules quite easily at 60mm aperture when the transparency is excellent. If the transparency is not there, then the image has less contrast and a lower signal to noise ratio making the low contrast spicules much harder to see, regardless of increase in aperture.

The other factor is spherical aberration at 393nm, but you have that sorted with the spaced objective lens. :)
Ok, transparency. This is a part of FD image in prime focus with visible proms and spicules, from the same session. Sure even with full resolution of 183 camera there are no small details, but more light and less noise, 0 gain, 2.2ms. I'll try to find the best match for such a case next time.
Thank you.
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Re: July 16 2022 CaK close-ups

Post by marktownley »

I think you're doing a great job with these CaK images Leo, it might help others to describe how you pull out the proms and spicules in post processing.


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Re: July 16 2022 CaK close-ups

Post by jp-brahic »

very nice Cak images !!!

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Re: July 16 2022 CaK close-ups

Post by LeoD »

Thank you, JP!
marktownley wrote: Fri Jul 22, 2022 5:19 am I think you're doing a great job with these CaK images Leo, it might help others to describe how you pull out the proms and spicules in post processing.
I'll be happy to share it in the chat . I got to get my wits about it, make another imaging session and once again check out the best way of limb processing.


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Re: July 16 2022 CaK close-ups

Post by christian viladrich »

This is excellent Leo !

Spicules and prominces are rather faint in Ca K (compared to Ha). No much can be done about it, except better seeing conditions and a Ca K filter with smaller FWHM.


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Re: July 16 2022 CaK close-ups

Post by arnedanielsen »

Excellent results, Leo!

You might have stated this earlier, but which CaK filter are you using again?

Best regards,
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Re: July 16 2022 CaK close-ups

Post by LeoD »

Thanks for kind comments!
Arne, It's usual Lunt 1800 CaK.


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Re: July 16 2022 CaK close-ups

Post by Carbon60 »

Amazing images Leo. You've got a great Lunt CaK filter there. Very nicely done.

Stu.


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