AR2738 in Ca K with TOA 150 and nice details

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christian viladrich
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AR2738 in Ca K with TOA 150 and nice details

Post by christian viladrich » Sat Apr 13, 2019 7:46 pm

The seeing was quite variable this morning. Still, I was lucky enough to get some nice details on this beautiful sunspot.
Alight bright seems to be developing. Will see to-morrow what will be next. A very thin dark filament is splitting in two the light bridge. The width of this dark filament is about 0.5 arcsec.
Some penumbral filaments are seen plunging into the umbra.
Image

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Re: AR2738 in Ca K with TOA 150 and nice details

Post by MalVeauX » Sat Apr 13, 2019 7:53 pm

Lovely Christian!

Very best,

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Re: AR2738 in Ca K with TOA 150 and nice details

Post by krakatoa1883 » Sat Apr 13, 2019 8:33 pm

Wow, Christian, this is a really stunning image, how many details inside the umbra! :bow
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Re: AR2738 in Ca K with TOA 150 and nice details

Post by Sol seeker uk » Sat Apr 13, 2019 8:36 pm

Oh wow..really nice..

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Re: AR2738 in Ca K with TOA 150 and nice details

Post by MapleRidge » Sat Apr 13, 2019 8:47 pm

An excellent shot indeed Christian...well done :bow

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Re: AR2738 in Ca K with TOA 150 and nice details

Post by John » Sat Apr 13, 2019 8:51 pm

That's another really beautiful image. Do you operate at close to the calculated optimal focal ratio (f15ish) for CaK with the ASI290?

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Re: AR2738 in Ca K with TOA 150 and nice details

Post by marktownley » Sat Apr 13, 2019 9:23 pm

That's an outstanding image Christian! Remind what filter you are using for your sub aperture ERF? I've just tried the Astronomik L2 filter and was disappointed it gives about an ND2 cut in CaK, not what I needed.
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Re: AR2738 in Ca K with TOA 150 and nice details

Post by christian viladrich » Thu Apr 18, 2019 7:57 am

Thanks to all :-)
John : my F/D is about 22, so the sampling is about x2.8 the resolving power. Experience shows the optimal sampling is about X3 the resolution power (and not x2 as usually reported).
Mark : I am using a blue Astronomik filter which has an excellent transmission in Ca K. The newest Astronomik blue filters cut Ca K (this is to reduce the chromatic aberration on LRGB images taken with refractors). I don't know when they made the change.
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Re: AR2738 in Ca K with TOA 150 and nice details

Post by marktownley » Thu Apr 18, 2019 8:18 am

Thanks Christian. Shame about the Astronomik blue changing. The Baader Blue CCD filter has transmission in CaK but is not as high as I would like. I may try the Astronomik L3 as this seems to extend quite a bit further into the blue. It's a shame the 50.8mm filters from Andover / EO don't fit else there's a few options there that would work too.
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Re: AR2738 in Ca K with TOA 150 and nice details

Post by Montana » Thu Apr 18, 2019 11:41 am

Such a beauty to sit and stare at, I am always thrilled to see your images :bow :hamster: how do you get them so smooth and noise free?

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Re: AR2738 in Ca K with TOA 150 and nice details

Post by MAURITS » Thu Apr 18, 2019 5:24 pm

Top Christian wow.
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Re: AR2738 in Ca K with TOA 150 and nice details

Post by Valery » Thu Apr 18, 2019 5:26 pm

So successful weekend, Christian!


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Re: AR2738 in Ca K with TOA 150 and nice details

Post by ffellah » Thu Apr 18, 2019 6:24 pm

That is a beauty, Christian !

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