Active region on May 22

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gabrieli
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Active region on May 22

Post by gabrieli » Fri May 22, 2020 9:30 pm

There wasn't much improvement in seeing from last day, but the active region made up for it.
I used my 7" inch Mak again, this time in double stack mode using a 35 nm Ha filter + 2X Powermate + LS50F +
+ Quark Combo + tilter + 0.5X reducer + Blackfly S (3.2Mp). This gave an efl of about 2700mm, probably a bit high for the conditions (only one image out of a dozen was acceptable).

The module itself is heavy. I hesitated to switch the order of the two etalons. The 2X Powermate seems able to support the LS50F + the rest of the image train. I also feel more comfortable that the image train is nearly vertical to reduce the tendency to "flex".

My c9.25 will produce a smaller image scale than this 7 inch with the same double stack module
(2300mm instead of 2700mm). I'll try that scope next time.

Lou
5012p.jpg
5012p.jpg (667.1 KiB) Viewed 150 times
5012n.jpg
5012n.jpg (704.57 KiB) Viewed 150 times
Ha mod.JPG
Ha mod.JPG (1.57 MiB) Viewed 150 times
Last edited by gabrieli on Fri May 22, 2020 9:53 pm, edited 1 time in total.



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Re: Active region on May 22

Post by p_zetner » Fri May 22, 2020 9:40 pm

Nice image, Lou.
Should be a promising combination under good seeing conditions.
What is the focal ratio at the LS50?
Cheers.
Peter



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Re: Active region on May 22

Post by gabrieli » Fri May 22, 2020 9:59 pm

Hi, Peter

Your question made me realize that there was an error in my figures. I was thinking of the 3X telecentric I had used the other day instead of the 2X Powermate I used for the current images. I corrected the efl values in this post.

The 7 inch Mak has a "prime" focal length of 2700 mm at f/15. I used the 2X Powermate as a telecentric which gives an efl at the LS50F of 5400 mm at f/30. The 0.5X reducer brings it back to 2700 mm.

Lou



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Re: Active region on May 22

Post by EGRAY-OBSERVATORY » Fri May 22, 2020 10:12 pm

Hi Lou,
Those two images must be near the limits of how apparently close to the surface we can get from terra-firma.
With the set-up you are using as well as 2700mm too, is something to make me jealous, but very well done.

Clear Skies.

Terry



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Re: Active region on May 22

Post by eroel » Fri May 22, 2020 11:13 pm

Lou:
Very nice results.
Best regards,
Eric.



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Re: Active region on May 22

Post by Carbon60 » Sat May 23, 2020 6:29 am

Very nice fine details, Lou. This will be a stunner under ideal seeing conditions.

Stu.


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Re: Active region on May 22

Post by yltansg » Sat May 23, 2020 6:42 am

Hi Lou,

Very nice HA close-up with that extremely long imaging train!

Alfred



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Re: Active region on May 22

Post by GreatAttractor » Sat May 23, 2020 7:52 am

That's a great result and an interesting setup! I loved my former SW Mak 180 for white light work, but didn't see an easy way to use it for Hα. I may revisit it in the future (perhaps a Quark Combo?).

Do you perhaps have some images made with only the Mak + TV2x + LS50F?


My software:
Stackistry — an open-source cross-platform image stacker
ImPPG — stack post-processing and animation alignment
My images

SW Mak-Cass 127, ATM Hα scope (D=90 mm, LS50 etalon), Lunt LS50THa, ATM SSM, ATM Newt 300/1500 mm, PGR Chameleon 3 mono (ICX445)

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Re: Active region on May 22

Post by Montana » Sat May 23, 2020 10:54 am

Stunning images Lou, I look forward to more :bow :hamster:

Alexandra



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Re: Active region on May 22

Post by dhkaiser » Sat May 23, 2020 12:27 pm

Yes extremely long imaging train, nice job.


Dan
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Re: Active region on May 22

Post by solarGain » Sat May 23, 2020 3:12 pm

Excellent images Gabrieli. I must get around to imaging in Ha!
John



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Re: Active region on May 22

Post by marktownley » Mon May 25, 2020 11:26 am

Very impressive Lou!


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http://brierleyhillsolar.blogspot.co.uk/
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