AR2738 in CaK

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bart1805
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AR2738 in CaK

Post by bart1805 » Fri Apr 12, 2019 9:35 pm

The idea for today was to image the sun in 5 wavelengths:
CaK
K-Line
Solar Continuum
White Light
H-alpha

But I only succeeded in taking one (1) AVI when the clouds rolled in.... So here is AR2738 in CaK.
100mm ED f/9 _ nosepiece of Lunt filter _ single K-line _ 2 PST#1 filters _ ASI290MM

ImageMoon_111413_120419_Gain=64(off)_Exposure=5.9ms_Gamma=63apsize3232601_IMPPG_UM6 by bart moors, on Flickr

The picture is clearly undersampled, so I tried 1,5x Drizzle in AS!3.

ImageMoon_111413_120419_Gain=64(off)_Exposure=5_randPS by bart moors, on Flickr

I kind of like the Drizzle version.

Thanks for watching!
Bart.

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ffellah
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Re: AR2738 in CaK

Post by ffellah » Fri Apr 12, 2019 11:55 pm

Very nice images, Bart !

Franco

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Re: AR2738 in CaK

Post by marktownley » Sat Apr 13, 2019 7:20 am

They came out well Bart. What do you think an ideal focal ratio with this scope and camera setup would be?
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Re: AR2738 in CaK

Post by bart1805 » Sat Apr 13, 2019 10:29 am

marktownley wrote:
Sat Apr 13, 2019 7:20 am
They came out well Bart. What do you think an ideal focal ratio with this scope and camera setup would be?
Thanks Franco and Mark!
Hard to say Mark, but I think somewhere between f/14 and f/16.

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Re: AR2738 in CaK

Post by marktownley » Sat Apr 13, 2019 5:04 pm

Interesting Bart, I can image reasonably regularly this time of year with 100mm CaK at f15 ish, the 290 with its small pixels and fast frame rate offers a pleasing proposition... That is a focal ratio I could reach with the HaT and a 540nm filter too for some white light closeups... I'm selling it to myself here aren't I :lol:
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Re: AR2738 in CaK

Post by MAURITS » Sat Apr 13, 2019 5:48 pm

Very fine details Bart.
Regards,
Maurits

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Re: AR2738 in CaK

Post by Carbon60 » Sat Apr 13, 2019 7:27 pm

Nice images, Bart. The drizzle version looks great.

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Re: AR2738 in CaK

Post by krakatoa1883 » Sat Apr 13, 2019 8:14 pm

Beautiful images, Bart!
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Re: AR2738 in CaK

Post by MapleRidge » Sat Apr 13, 2019 8:48 pm

Lovely detail in the image Bart, and the drizzle version certainly looks the best to me.

Well done :bow

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Re: AR2738 in CaK

Post by John » Sat Apr 13, 2019 9:04 pm

Super image despite your session being cut short. Are you using the Skywatcher Evostar scope? If so how do you think it compares with other scopes you have used for Cak?

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Re: AR2738 in CaK

Post by bart1805 » Sun Apr 14, 2019 1:48 pm

John wrote:
Sat Apr 13, 2019 9:04 pm
Super image despite your session being cut short. Are you using the Skywatcher Evostar scope? If so how do you think it compares with other scopes you have used for Cak?
Thanks guys!
No, it is an old Celestron 100mm F/9 ED. It is way better than the 150mm f/8 Skywatcher achromat.

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Re: AR2738 in CaK

Post by christian viladrich » Mon Apr 15, 2019 7:01 pm

Hello Bart,
I prefer the one without drizzle. Inverse granulation is lost in the drizzle version.
Christian Viladrich
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Re: AR2738 in CaK

Post by bart1805 » Mon Apr 15, 2019 7:22 pm

christian viladrich wrote:
Mon Apr 15, 2019 7:01 pm
Hello Bart,
I prefer the one without drizzle. Inverse granulation is lost in the drizzle version.
You are right Christian, I did not notice it before you mentioned it. Should try and reprocess the drizzled version. Thanks! Bart.

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