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Featured Stargazing Solar imaging and techniques

  1. Jan 1, 2018 #101

    sophiecentaur

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    Unsharp mask does the biz for most pictures. It's basically a sharpening process (high pass / boost) with a threshold, below which it doesn't operate. So it enhances transitions but you can hold back for low level patterns / noise. The 'radius' button adjusts the range over which you do the enhancing. You always have to check the whole picture or a sharp edge can have a black / white border.
    You really have to try it. It does a lot for craters and highlights in eyes.
     
  2. Jan 4, 2018 #102

    davenn

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    well, it's been a productive summer holiday in a number of ways.
    Got a few things done around the place that had been outstanding for a while. One of them was to finally put my HEQ5 PRO GOTO
    telescope mount to use ... it's only taken one and a half years 1f609.png
    Below a couple of images of the mount with the Lunt LS60 THA solar scope mounted to it

    IMG_1093sm.jpg

    IMG_1096sm.jpg


    Dave
     
    Last edited: Jan 4, 2018
  3. Jan 5, 2018 #103

    davenn

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    A couple of images from today 05 Jan 2018

    one very large prominence and several smallish filaments

    180105 Capture_0001.jpg


    180105 Capture_0005.jpg


    Dave
     
  4. Jan 7, 2018 #104

    davenn

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    The Sun in Ha for 7 Jan 2018

    some nice large prominences and a long filament

    180107 Ha Prom 05 sm.jpg

    180107 Ha full disk sm.jpg


    Dave
     
  5. Jan 15, 2018 #105

    davenn

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    The Sun in Ha for 15 Jan 2018
    some nice large prominences and a couple of filament near an active region

    180115 Ha 01.jpg

    180115 Ha 04.jpg

    180115 Ha 09.jpg



    Dave
     
  6. Jan 15, 2018 #106

    sophiecentaur

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    @davenn terrific detail. You are getting your money's worth.
     
  7. Jan 15, 2018 #107

    davenn

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    cheers mate :smile:

    and I have just spent another AU$1400 today on a better camera
    all the guys on various astro forums are telling me I should be using a monochrome camera for getting much better resolution
    so I have purchased the ZWO ASI1600MM
    https://www.bintel.com.au/product/zwo-asi1600mm-monochrome/

    will be interesting to see the results

    Dave
     
  8. Jan 20, 2018 #108

    davenn

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    Hi guys

    well the ZWO ASI 1600MM finally arrived ( after the postal system sat on it for 3 days default_frown.gif )
    I did some comparisons between it and my ZWO ASI 178MC that had been the main solar cam up till today
    The ASI 1600 is a 16MPix Monochrome camera

    these first two are unprocessed ( SOOC ) , just resized for the forum
    and ALL images are single frame only ( no stacking)

    firstly ... the ASI 178MC using mono mode in SharpCap

    5a6302afdacd6_Capture_0001ASI178.thumb.jpg.d74657519dd0c5dad3fb9c39667e8ae6.jpg


    Now the ASI 1600MM

    Capture_0083 ASI1600.jpg


    NOTE:, tho the image from the 178MC looks more detailed. Strong brightness variation can be seen across the image compared to the 1600MM
    What I discovered in processing was that the 1600MM image processed so much better and resulted in a significant increase in finer details default_smile.gif

    ASI178 processed ...

    180120 ASI178 Cap001.jpg

    ASI1600 processed ....

    180120 ASI1600 Cap001sm.jpg

    There isn't really any comparison between the two ..... the ASI1600 shows much better detail. Specially seen around the Active Region

    Next post .... prominences

    Dave
     
  9. Jan 20, 2018 #109

    davenn

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    now some limb/prominences
    Ohhh golly gosh !!!
    again, these first two are unprocessed ( SOOC ) , just resized for the forum

    ASI178MC

    Capture_0004 ASI178.jpg


    ASI 1600MM

    Capture_0008 ASI1600.jpg


    The limb and prominences are just so much sharper for the 1600MM

    The 1600MM with a little processing

    180120 ASI1600Cap011.jpg

    Dave
     
  10. Jan 20, 2018 #110

    davenn

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    The ASI 1600MM seems to have a better dynamic range ( well I would expect it to default_wink.gif )
    it is easier to pull out prominences and still have a non- overexposed surface
    please excuse the poor editing blotchiness in the dark area around the outside of the sun ( I don't claim to be the world's best editor default_wink.gif )

    upload_2018-1-20_21-9-58.png


    Dave
     
  11. Jan 20, 2018 #111

    sophiecentaur

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    Nice pictures (as usual) Dave. As with the rest of (technical) life, you get what you pay for.
    The detail after enhancement makes you want to touch it. It's that lovely illusion (as with the best TV pictures, viewed at the right distance) that you could just go closer and closer with no limit to the image detail.
     
  12. Jan 20, 2018 #112
    I'm sure it's not just my digital device that ... I magnify, magnify, magnify ... and still get to see a picture of the Sun (huger and huger detail!) ...
    Pretty cool!
     
  13. Jan 20, 2018 #113

    davenn

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    Thanks buddy :smile:

    So true it looks like the AU$1400 for this latest camera was worth the expense :smile:

    cheers
    buddy

    and these pix here have been compressed in physical and kb size by the forum software

    here's a link to the larger ( but not full size) rendition that I posted on other forums that don't have the restrictions

    https://s10.postimg.org/eamdzbxex/180120_ASI1600_Cap001sm.jpg

    the finer detail around that active region ( right area centre right, just to the left of that dark filament ) really starts to stand out


    Dave
     
  14. Jan 20, 2018 #114

    davenn

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    A closer up view of the active region .....

    180120 Capture_0002.jpg
     
  15. Jan 20, 2018 #115

    sophiecentaur

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    Totes amaze - as they say.
     
  16. Jan 28, 2018 #116

    davenn

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    The Sun in Ha, 28/01/2018
    Finally some clear(ish) skies at a time of the day that I could do some observing and imaging
    Some really nice prominences today ...but the surface was pretty much devoid of interesting features

    180128 Cap01sm.jpg

    180128 Cap13sm.jpg

    180128 Cap21sm.jpg

    180128 Cap23sm.jpg



    Cheers
    Dave
     
    Last edited: Jan 28, 2018
  17. Jan 28, 2018 #117
    Wow! It seems it's like "prominence day" today for the sun! ...
     
  18. Jan 28, 2018 #118

    davenn

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    yes, very much so
    a nice collection :smile:
     
  19. Feb 3, 2018 #119

    davenn

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    The Sun in Ha -- 4 Feb, 2018

    Haven't seen much of the sun for the last week ( since last Sunday's images) Lunt LS60THa, ASI 1600MM camera and SharpCap software.
    These are single frame images (no stacking)

    A couple of cropped to zoom in on the prominences and a couple of full disk .... varying the exposure allows different features to be more easily seen

    180204 Cap010 Ha.jpg

    180204 Cap021sm crop Ha.jpg


    180204 Cap015sm Ha.jpg



    180204 Cap021sm Ha.jpg



    cheers
    Dave
     
  20. Feb 4, 2018 #120

    sophiecentaur

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    Nice pictures again, Dave. I wonder if it would be worth while tinkering with and stacking multiple exposures to include a bigger range of luminosities. I have a chum who has done this with some regular photographs and increased the contrast range successfully. (Just a thought)
     
  21. Feb 7, 2018 #121

    davenn

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    07 Feb 2018, The Sun in Ha ....
    Lunt LS60THa, ASI 1600MM camera and SharpCap software.
    These are single frame images (no stacking)


    finally a reasonable spot group. The best for many months

    ab.jpg

    aa.jpg

    ac.jpg


    cheers
    Dave
     
  22. Feb 10, 2018 #122

    davenn

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    10 Feb 2018, The Sun in Ha .... The very respectable sunspot group ( largest for at least 4 months) has moved further onto the disk and is displaying some good details. Lunt LS60THa, ASI 1600MM camera and SharpCap software. These are single frame images (no stacking)

    180210 Cap_014sm.jpg


    the second image is closeup of the active region, the best for some months, the black sunspots can be seen along with the bright areas of flaring between them

    180210 Cap_026.jpg


    cheers
    Dave
     
  23. Mar 2, 2018 #123

    davenn

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    The Sun in Ha, 3 March 2018

    Been a couple of weeks since I last got a chance to do some solar observing/imaging some Ha images from today. One very large prominence and some filaments .... Lunt LS60THa and a ASI1600MM camera

    180303 Cap001sm.jpg

    180303 Cap005sm.jpg

    180303 Cap014sm.jpg

    180303 Cap027.jpg


    Dave
     
  24. Mar 3, 2018 #124
    Awesome!
    Some colour next time? (I like both)
     
  25. Mar 6, 2018 #125

    davenn

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    hi guys and gals

    for those interested in solar observations and imaging, I have found a very useful tool for determining the size of
    features on the sun eg. sunspots, filaments and prominences etc

    I present the Solar Ruler, available here .....
    https://samuelastronomy.wordpress.com/tag/solar-ruler/

    there is an English version here .....
    http://thesolarexplorer.net/index.php/tutorial/article2/article2/the-solar-ruler
    the download link is right at the bottom of the page

    This is a PDF file that you load into your fav image processing program that is able to support the manipulation of layers when combined

    For me, I use Photoshop (PS). I load in my solar image and I load in this PDF file they are in separate tabs at the top of the image viewing area

    I resize the solar ruler image to equal the size of my solar image as close as possible, then I copy it and paste it over the top of the solar image.
    I then use the move function to move the solar ruler image around so I can align it with the solar image to produce this result

    Solar image is the first image from my previous post ........

    NOTE: the image is seriously reduced in size and quality to be able to post on this forum

    180303 Cap0012asm.jpg


    You can see I managed to get the solar and ruler image sizes to match reasonably well

    I can now quickly determine the approx. size of that big prominence .... ~ 60,000 - 65,000 km in height above the suns disk !!

    Quite impressive
    hope some finds this useful :smile:

    Dave
     
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