Results 1 to 7 of 7
Like Tree1Likes
  • 1 Post By Rob Kenning

Thread: Blurry stars

  1. #1
    depratnt's Avatar
    depratnt is offline SUPER GIANT
    Points: 15,232, Level: 85
    Level completed: 10%, Points required for next Level: 318
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!First 1000 Experience Points
    Join Date
    Oct 2015
    Location
    Colorado
    Posts
    802
    Points
    15,232
    Level
    85
    Thanks
    78
    Thanked 248x 166 Posts

    Default Blurry stars



    hey all,

    last night when i was imaging orion and the beehive cluster i was using 3-4 minute exposures and each picture I took, the stars began to blur (not elongate) more and more with each picture until it looked like they have a blue ora/ring around them, I cant figure it out.The tracking looked great but maybe i had the iso too high (1600)? I noticed when i went doen to iso 800 it helped a tad but not all that much. The final stacked image was even worse. The stars were completely blown out and not sharp (I didnt take any darks, flats, or exposures under 2 minutes).
    Thanks yall!
    -Teagan

    -Mount: iOptron CEM60Telescope: Astro-Tech 8rc, Astro-Tech 65mm EDQ, Celestron 8SE, William Optics 50mm Guidescope, Guide Camera:QHY5L-II, Imaging Camera: Atik 414 ex Monochrome CCD, Canon Rebel XS (1000D), Software:PHD2, Other:A whole lot of passion

  2. #2
    pederv's Avatar
    pederv is offline HYPER GIANT
    Points: 16,235, Level: 87
    Level completed: 96%, Points required for next Level: 15
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience Points365 Days+ Registered Achievement!400+ Posts Achievement750 Days+ Registered Achievement!
    Join Date
    Sep 2010
    Location
    Kirkland, WA
    Posts
    2,431
    Points
    16,235
    Level
    87
    Thanks
    131
    Thanked 748x 630 Posts

    Default Re: Blurry stars

    Dew?
    Frost?
    One of the two will make your images progressively worse as it builds up.
    What did your optics look like?
    Name - Verne / Call sign - KF7UHL

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    - Orion Atlas 10 EQ-G
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    / Orion 130ST on an AstroView Mount with RA Drive
    EPs - Orion Plossl (10mm, 25mm, 32mm, 40mm), Tele Vue Plossl (32mm), Orion Stratus (5mm), 12.5mm Orion Illuminated, 7-21mm Orion Explorer II, set of Orion Q70's
    Camera Adapters - SteadyPix Deluxe, Orion Universal, Digi-Kit DK118, T-ring, 2 inch EOS
    Camera - Canon 5D Mk II, Canon T6i, Panasonic FZ35, Celestron NexImage


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  3. #3
    Christo's Avatar
    Christo is offline HYPER GIANT
    Points: 31,208, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 7.0%
    Achievements:
    5 Threads Achievement!50 Posts Achievement!First 1000 Experience Points200+ Posts Achievement!2 Posts Achievement
    Join Date
    Feb 2012
    Location
    North Eastern, USA
    Posts
    1,907
    Points
    31,208
    Level
    100
    Thanks
    762
    Thanked 359x 322 Posts

    Default Re: Blurry stars

    Assuming you were using the Celestron SCT listed it could be your collimation is off enough that you are picking up that wave length of light which is why you saw less at 800 than at 1600. I would check with a star test near the area you plan to image next time and see what happens and what the star test shows maybe before and after adjustment.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Esprit 100, Skywatcher Pro 120ED, Meade ETX90, AstroTech 72ED II, Celestron C8, Astromania 60mm Guidescope, Celestron AVX Mount,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Atlas Mount, Explore Scientific Twilight 1, QSI 683 WSG, Astrodon Filters(LRGB and 3nm), ZWO 183MM Pro, ZWO LRGB Filters, Canon T3i & XSi(XSi is a full mod), ZWO ASI 120MC & ZWO ASI 120MM-S, as well as for the daytime a Lunt 35mm Ha Solar
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Lunt 1.25 Hershel Wedge, and White Light Filters

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  4. #4
    STEVE333's Avatar
    STEVE333 is offline Bronze Supporter
    Points: 114,596, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 26.0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!50 Posts Achievement!First 1000 Experience Points
    Join Date
    Apr 2013
    Location
    Santa Cruz, CA (USA)
    Posts
    5,681
    Points
    114,596
    Level
    100
    Thanks
    2,369
    Thanked 2,757x 2,491 Posts

    Default Re: Blurry stars

    Is it possible that high thin clouds and/or light overcast was coming in and causing the seeing to get worse and worse? Those conditions will definitely cause blurry stars.

    Steve
    Steve King:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    (
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    5) - SQM 19.08 mag./arc sec2 @
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    + Mount + Guiding:
    W.O. Star71-ii or ES ED102 CF +
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ZEQ25GT +
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Magnificent Mini AutoGuider
    Camera + Filter: Canon EOS Rebel T3 1100D (modified) + Triad Tri-Band or IDAS-LPS-D1 or Duo-Band Filter in Baader Protective T-Ring

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    PHD2; BYEOS; PixInsight; QPPA2_________My AP website
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    href="https://farm8.staticflickr.com/7895/47450127671_929ded9a38_b.jpg" rel="lightbox[signatures]">
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  5. #5
    KathyNS's Avatar
    KathyNS is offline Super Moderator
    Points: 174,739, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 1.0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience Points400+ Posts AchievementGot three Friends
    Awards:
    Activity & Post & Thread Master
    Join Date
    Nov 2010
    Location
    Nova Scotia
    Posts
    25,318
    Points
    174,739
    Level
    100
    Thanks
    6,661
    Thanked 14,997x 9,551 Posts
    Blog Entries
    3

    Default Re: Blurry stars

    Of the possibilities already mentioned, dew, frost, or clouds sound likely. It doesn't sound like a collimation issue - collimation doesn't typically go badly out of whack during a session. Other possibilities would include a shifting focuser or camera mount, or a large temperature change.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    DSO AP:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    (pier);
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    .

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  6. #6
    Rob Kenning's Avatar
    Rob Kenning is offline White Dwarf
    Points: 3,250, Level: 37
    Level completed: 34%, Points required for next Level: 100
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!First 1000 Experience Points
    Join Date
    May 2015
    Location
    Australia
    Posts
    17
    Points
    3,250
    Level
    37
    Thanks
    13
    Thanked 4x 4 Posts

    Default Re: Blurry stars

    Hi TG,
    I had similar problems last night. I had the Edgehd8 setup first and couldn't get pin sharp stars. I mounted the ed80 refractor and got slightly better results but still not pin sharp.
    There was a very thin cloud cover, according to the satview site I monitor, even though I couldn't see evidence of any clouds visually.
    As a consequence, I had to ditch the entire nights photos from the piggyback 500ml lens/D5300 combo. Hopefully tonight will be clearer.
    Cheers Rob
    pederv likes this.

  7. #7
    pederv's Avatar
    pederv is offline HYPER GIANT
    Points: 16,235, Level: 87
    Level completed: 96%, Points required for next Level: 15
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience Points365 Days+ Registered Achievement!400+ Posts Achievement750 Days+ Registered Achievement!
    Join Date
    Sep 2010
    Location
    Kirkland, WA
    Posts
    2,431
    Points
    16,235
    Level
    87
    Thanks
    131
    Thanked 748x 630 Posts

    Default Re: Blurry stars

    Quote Originally Posted by Rob Kenning View Post
    Hi TG,
    I had similar problems last night. I had the Edgehd8 setup first and couldn't get pin sharp stars. I mounted the ed80 refractor and got slightly better results but still not pin sharp.
    There was a very thin cloud cover, according to the satview site I monitor, even though I couldn't see evidence of any clouds visually.
    As a consequence, I had to ditch the entire nights photos from the piggyback 500ml lens/D5300 combo. Hopefully tonight will be clearer.
    Cheers Rob
    I also check the visual satellite, before heading out to setup. Using the sunset and moonrise to check on the status of those high thin clouds, is something that has just become automatic. Unless I head for the dry side of the state, I almost always have some degree of high cloud cover during a "clear" night.
    Hope you found suggestions on how to circumvent or become aware of some of the possible issues you may have been experiencing.
    Name - Verne / Call sign - KF7UHL

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    - Orion Atlas 10 EQ-G
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    / Orion 130ST on an AstroView Mount with RA Drive
    EPs - Orion Plossl (10mm, 25mm, 32mm, 40mm), Tele Vue Plossl (32mm), Orion Stratus (5mm), 12.5mm Orion Illuminated, 7-21mm Orion Explorer II, set of Orion Q70's
    Camera Adapters - SteadyPix Deluxe, Orion Universal, Digi-Kit DK118, T-ring, 2 inch EOS
    Camera - Canon 5D Mk II, Canon T6i, Panasonic FZ35, Celestron NexImage


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

 

 

Similar Threads

  1. I see blurry stars.
    By M104 in forum Astronomy Beginners Forum
    Replies: 7
    Last Post: 01-02-2016, 08:04 PM
  2. Everything is blurry! Please help!
    By Weirdcake in forum Astronomy Beginners Forum
    Replies: 6
    Last Post: 04-11-2014, 03:51 PM
  3. Blurry, AGAIN!
    By zs-kev in forum Astronomy Beginners Forum
    Replies: 13
    Last Post: 04-05-2014, 01:27 AM
  4. DSLR Deep Sky Imaging: A blurry m31
    By Genty in forum Astrophotography Forum
    Replies: 9
    Last Post: 09-30-2013, 10:25 PM
  5. Blurry stars at edges of photo?
    By Zrider1967 in forum Astro Imaging Forum
    Replies: 9
    Last Post: 09-14-2012, 11:41 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 09:06 AM.