2022-02-23 - AR2954/2955 HA closeup

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JochenM
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2022-02-23 - AR2954/2955 HA closeup

Post by JochenM »

A nice blue sky greeted me this morning (long gone in the meanwhile of course), so figured I'd sneak a quick session in. Conditions were surprisingly good (for H-Alpha at least; Continuum and CaK looked like a blurry mush).

AR2954/2955 on the Eastern limb is looking quite nice and active (no surprise given what we've seen the last few days).

Setup:

150mm achromat @ 120mm f/42
Quark Chromosphere
Baader 35nm H-Alpha
ASI174

Thanks for looking!

Image

Image


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by daniele_bonfiglio »

Wonderful images!
What do you mean by "150mm achromat @ 120mm" ? are you obstructing your 150mm to become a 120mm? why? (sorry for the possibly naive question)
Best, Daniele


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by rigel123 »

Excellent shot Jochen!


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by ffellah »

Fabulous pictures Jochen. Good to see you back imaging !

Franco


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by JochenM »

daniele_bonfiglio wrote: Wed Feb 23, 2022 2:48 pm Wonderful images!
What do you mean by "150mm achromat @ 120mm" ? are you obstructing your 150mm to become a 120mm? why? (sorry for the possibly naive question)
Best, Daniele
Thanks Daniele.

Not a naive question at all :) It's pretty much exactly what it sounds like. I used an aperture mask to stop down the opening of the lens to 120mm.

The reasoning behind doing this is essentially catering to the atmospheric conditions in my area. Very simply put, the higher the aperture of the instrument you're using; the more stable your atmospheric conditions (seeing) needs to be to use its full resolution. Conditions here today weren't as such that I would have been able to use the 150mm to its fullest extent; so I opted to stop down to something more reasonable. How much you stop down is always a bit of trial and error; but I've done it enough to usually guess pretty accurately :)

Hope this helps.


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by JochenM »

Cheers Warren/Franco.

With winter slowly passing; hopefully there'll be more to come :)


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by EGRAY_OBSERVATORY »

Perhaps the best close-up's I've seen for ages Jochen.

Absolutely perfect- showing all the activity around AR2955 and 2954, which can't really be bettered.

15 out of 10 for the effort and results.

Regards
Terry


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by JochenM »

Cheers Terry, that's quite the compliment there :)

I've been playing a bit more with the CaK captures in the meanwhile. I managed to turn one into something somewhat decent (not great, but acceptable in my eyes).

Setup:

150mm achromat @ 100mm f15, Baader Blue CCD, Lunt CaK b1800, ASI290

Image

PS: I know the orientation is wrong ;)


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by daniele_bonfiglio »

JochenM wrote: Wed Feb 23, 2022 3:16 pm
daniele_bonfiglio wrote: Wed Feb 23, 2022 2:48 pm Wonderful images!
What do you mean by "150mm achromat @ 120mm" ? are you obstructing your 150mm to become a 120mm? why? (sorry for the possibly naive question)
Best, Daniele
Thanks Daniele.

Not a naive question at all :) It's pretty much exactly what it sounds like. I used an aperture mask to stop down the opening of the lens to 120mm.

The reasoning behind doing this is essentially catering to the atmospheric conditions in my area. Very simply put, the higher the aperture of the instrument you're using; the more stable your atmospheric conditions (seeing) needs to be to use its full resolution. Conditions here today weren't as such that I would have been able to use the 150mm to its fullest extent; so I opted to stop down to something more reasonable. How much you stop down is always a bit of trial and error; but I've done it enough to usually guess pretty accurately :)

Hope this helps.
Hi Jochen, thank you for the explanation! But I still don't fully understand why not just keeping the full aperture. That would not hurt anyway I guess, even if given your seeing the theoretical resolution of your instrument could not be achieved... maybe this has to do also with optical aberrations that will be stronger at full aperture? and so by stopping down you limit those aberrations while not losing in resolution that would be anyway out of reach due to the seeing conditions?


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by DeepSolar64 »

Very nice Jochen! I see a No 2 filament! :lol: Keep em' coming. I have missed your images!


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by JochenM »

daniele_bonfiglio wrote: Wed Feb 23, 2022 3:31 pm Hi Jochen, thank you for the explanation! But I still don't fully understand why not just keeping the full aperture. That would not hurt anyway I guess, even if given your seeing the theoretical resolution of your instrument could not be achieved... maybe this has to do also with optical aberrations that will be stronger at full aperture? and so by stopping down you limit those aberrations while not losing in resolution that would be anyway out of reach due to the seeing conditions?
Hi Daniele.

The aberrations in the glass absolutely play a role as well. Although in this case, it wouldn't be too bad in the red end of the spectrum. More towards the blue (CaK imaging for example) would be a different story as these cheap achromats are not all that well corrected there.

It all comes down to optimally sampling for the conditions you're given (or well, getting as close as you can practically get). Have a look at the following thread for a more detailed explanation (and explained much more eloquently than I ever could). The owner of that post also created a little tool to make some quick sampling calculations. I'll attach it to this post.

viewtopic.php?p=279929#p279929
Attachments
Angular Resolution, Seeing & Critical Sampling Calculator.xls
(13 KiB) Downloaded 41 times


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by EGRAY_OBSERVATORY »

Thanks Jochen - regardless of the orientation, that CaK image through your BF1800 shows a lot of fine detail, so you will have some excellent results with that set-up, if not already achieved.

I have the Lunt 60 CaK scope with the BF1200 filter, which can produce some excellent results, but would like the BF1800 too and also for my Lunt 60mm Ha scope too...

Cheers
Terry


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by rsfoto »

Hi Jochen,

Well done


regards Rainer

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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by ffellah »

Very nice CaK addition, Jochen.

Franco


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by Albuqshutterbug »

Beautiful detail Jochen.
Well done.


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by MapleRidge »

Hi Jochen...

Thanks for posting these sharp Ha and CaK images...well done :bow

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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by JochenM »

Cheers guys.


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by rsfoto »

Hi Jochen,

Well deserved


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Re: 2022-02-23 - AR2954/2955 HA closeup

Post by DavM »

Great captures Jochen!

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