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  1. #11
    not_Fritz_Argelander's Avatar
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    Default Re: strange stars



    Quote Originally Posted by vvferi View Post
    Maybe... the thermal stress is a black hole for me.
    It needs some care but can be managed. First thing I'd try is more time (to let the system get into equilibrium) and patience. Less aggressive heating on the objective and cooling on the camera end could make a difference. Experiment, trying one thing different at a time.
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  3. #12
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    Default Re: strange stars

    Classic pinched optics on ED crystalline structure. Had one that showed same pattern. You can try and loosen the lens retaining ring. If it is a machined cell, then the cell is actually shrinking (contracting) more than the ED glass, compressing the crystal lens. Dew heaters do not have enough thermal energy to cause this. I had to send my scope back for a replacement. It was an Orion 120mm ED EON. Orion replaced it no problem. You can work with the vendor and get it replaced!

    Pattern in cold weather
    M42 2-21-09 120mm EON cold.jpg

    Same scope but during warmer temps
    M27 7-03-2016 120mm EON warm.jpg

    JJ
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    Scopes: 20"Obsession F5 Dobsonian with ArgoNavis-ServoCat Drive & 10K DSC's. OTA's: Orion 6" F5, Meade SN6 F5, Orion 120mm F7.5 EON ED, AT 72mm F6 ED. Mounts:SW EQ-6 GT on LX850 3" Leg Tripod with pier, CG5-ASGT, Vixen SP DA drive on Celestron 2" SS Leg tripod. Eyepieces:Televue:31mm T5, 22-17-12mm T4's, 10 & 8mm Ethos, 2" 2X Powermate, 1.25" 2.5X Barlow. Baader Hyperion:21-17-13-10-8-5mm.

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  5. #13
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    Default Re: strange stars

    Thank you all for giving me so much help! I think I have learned a lot!
    And I think it is a good way, to give you something experience back, from my misstakes.
    So, I dig out pictures from the past, and found, that 2 years ago I made pictures as much as conditions, like a week ago. And spikes were there too, but I did not payed attention enough. This 2015. January 7 picture shows, that the termel difference between lense temperature (outside temp., lets not deal with dewheating) and CCD temperature was 10°C, and there were spikes. The picture 2014. August 18.shows, that the termal difference between lense temperature (outside temp., and again, lets not deal with dewheating) and CCD temperature was 32°C, and there were NOT spikes. I tend to think, that there much more count the absolute outside temperature (lense, and lense holder cell temperature,) than the DIFFERENCE between CCD and lense, and lense holder cell temperature (outside temperature). I hope that you could read my not too perfect English ngc2244 reszlet techn2.jpgIC-1905 techn.jpg

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  7. #14
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    Default Re: strange stars

    Frost on the sensor?
    Bruce
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    CPC 800XLT, Takahashi 102 TSA, Takahashi Mewlon 250s, Lunt LS60PT Double Stack
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    Losmandy G11, Losmandy GM8, Borg SG4
    (Nagler 3-6, 7,13,22, Panoptic 35,41, Delos 6,14, Powermate 2"x2), Pentax 10 Televue 8 Plossl
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  9. #15
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    Default Re: strange stars

    So if it is pinched optics when it gets cold. What can be done if anything?

    Would a dew heater help?
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    Scopes: Home brew 6" Dob, Orion XT8G, Orion 130mm APO Triplet, Orion 8" f3.6 astrograph, atop a Orion Atas pro AZ/eq-G - Guiding: Orion 60mm f4 scope, Orion 'Star Shoot' autoguider camera, PHD2 software - Cams: Orion MP5 planetary ccd, Cannon Rebel SL1 (EOS 100D), BYEOS software, ATIK 383L+ Processing : Regisax, Deep Sky Stacker, Star Tools Assistant: One very large cat


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    Default Re: strange stars

    I have an EON 120 and am getting strange stars in cold weather. It doesn't appear in warm weather. I am going to try and turn my dew heater to high with it on my ota right below the dew shield. I made the mistake of placing the heater strap on the shield directly above lens retainer and still strange stars. I figure warming the ota my help

    Wayne
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  11. #17
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    Default Re: strange stars

    There is a 120 EON?
    Scopes: Home brew 6" Dob, Orion XT8G, Orion 130mm APO Triplet, Orion 8" f3.6 astrograph, atop a Orion Atas pro AZ/eq-G - Guiding: Orion 60mm f4 scope, Orion 'Star Shoot' autoguider camera, PHD2 software - Cams: Orion MP5 planetary ccd, Cannon Rebel SL1 (EOS 100D), BYEOS software, ATIK 383L+ Processing : Regisax, Deep Sky Stacker, Star Tools Assistant: One very large cat


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  12. #18
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    Default Re: strange stars

    Quote Originally Posted by UlteriorModem View Post
    There is a 120 EON?
    There used to be. Why Orion withdrew it is a mystery.

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    Default Re: strange stars

    It is an excellent scope. However it appears to have trouble in cold temps.
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  14. #20
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    Default Re: strange stars

    Quote Originally Posted by not_Fritz_Argelander View Post
    Possibly a thermal disequilibrium problem? My Rumak Mak Cass shows a threefold rather than your fivefold symmetric distortion when out of balance thermally.
    I am not sure ... Just wondering...By idea I put on the heating strap (~ 1,5" wide) right over the lenses. So the temperature in front of and behind the lenses should be near the same. Certainly just near, and I do not know, what is the difference which can make my stars funny.

 

 
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