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  1. #1
    Dublin sky watch's Avatar
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    Arrow When autoguiding turns bad!!



    As posted, here is a single image of M42guided with the solitaire.
    It is only 93" in total, but you can clearly see the effect around the stars.
    All comments welcome as to what may have caused this.
    The image was taken about 45 degrees above the Southern horizon.
    I am thinking it may have been a balance problem, but I really do not know as I have not encountered this type of horror. It looks jerky..
    Click to enlarge for better view.
    Thanks Guys and Gals.
    Attached Images Attached Images
    Declan.
    Celestron 8"Edge HD SCT.
    Skywatcher ED80mm refractor.
    Explore Scientific - 127mm f/7.5 Air-Spaced Triplet ED.
    Lunt - 60mm H-alpha Solar-Telescope with Double Stacked 50 Etalon system, B600 blocking filter and 2 " Crayford Focuser
    orion star shoot solitaire autoguider.
    Canon 5D Mark II dslr.
    Two men sat behind prison bars,One saw mud, the other saw stars. It's not where you are, it's what you see!!!

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    Declan, I think there was a bump to the scope mount at the middle of the exposure and the guiding tried to compensate.
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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    That was my initial thought Gus. I cant remember at the time if anything like that happened. So I assumed it was balancing. I might have a check through some more of the guiding images all the same..
    Declan.
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    Lunt - 60mm H-alpha Solar-Telescope with Double Stacked 50 Etalon system, B600 blocking filter and 2 " Crayford Focuser
    orion star shoot solitaire autoguider.
    Canon 5D Mark II dslr.
    Two men sat behind prison bars,One saw mud, the other saw stars. It's not where you are, it's what you see!!!

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    Declan,
    post an image of your setup. Also take a look at the balancing FAQ here:
    Balancing A German Equatorial Mount
    helped me quite a bit

    cheers
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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    Another thought would be if the guider lost the star for a moment. (airplane passes over and it catches it) (yes it does happen!) However I would start with the balance. Mine is critical!!!!

    Keep in mind to check it 'fully loaded' (camera and autoguider all wired up!) That reminds me also. Check for the wires to make sure nothing snags. (I've had that happen also!)

    Keep at it!
    Gordon
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    Maybe a cloud even, has happened to me.
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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    Were you guiding through a guide scope or OAG? Possible mirror shift, or are there locks on your mirror?
    Mike

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    mirror slump looks the most likely - the two parts of the image have equal exposure - could also be sticky travel vibration. How cold is it?
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    I don't think it's a balance issue in just 93 seconds. Once I finally got my autoguider working I realized balance is far less critical then I initially thought.
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  16. #10
    Dublin sky watch's Avatar
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    Using the guider that night was the first time I had ever used it. It was beeping every few seconds or so. On further investigation, I believe Gordon to be near the mark (and others) It was difficult keeping the guide star on course as there was a lot of high cloud. I think this may have been the issue. Just want ot know for future events...
    Thanks..
    Declan.
    Celestron 8"Edge HD SCT.
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    Lunt - 60mm H-alpha Solar-Telescope with Double Stacked 50 Etalon system, B600 blocking filter and 2 " Crayford Focuser
    orion star shoot solitaire autoguider.
    Canon 5D Mark II dslr.
    Two men sat behind prison bars,One saw mud, the other saw stars. It's not where you are, it's what you see!!!

 

 
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