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  1. #1
    luisovaladez's Avatar
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    Default High point scientific coma corrector



    Hey guys I recently purchased a high point scientific coma corrector to use on my 6" celestron omni xlt newtonian to take pictures with a DSLR. I took it out last night to give it a test run and I kept getting a reflection of the primary and secondary mirror in the pictures and my stars are very spiky. This only happens when I photograph bright stars. Have a look a my attachment, its a 30" exposure at ISO 800 at polaris. If anyone has had this happen please I would greatly appreciate you sharing your solution with me. My fist thought is that my telescope is not collimated. Thank you all for your time.

    Coma Corrector Photo & Visual For Netwonian Telescopes 2" | High Point Scientific
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  2. #2
    luisovaladez's Avatar
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    Default Re: High point scientific coma corrector

    Correction, that star is not Polaris. It is Sirius, my bad.

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    Smile Re: High point scientific coma corrector

    With a Newtonian the secondary spider will give you spikes when viewing bright objects. Your image look like it could be a little out of focus also.
    Bill

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  4. #4
    luisovaladez's Avatar
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    Default Re: High point scientific coma corrector

    yeah but that doesn't concern me as much as the reflection above Sirius. What do you make of that?

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    Default Re: High point scientific coma corrector

    I think the image is likely overexposed. Sirius is after all the brightest star in the sky. It will only need a short exposure. You have a big internal reflection there; those usually only register if the image is overexposed. Try significantly reducing the exposure and see how it turns out.

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  6. #6
    luisovaladez's Avatar
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    Default Re: High point scientific coma corrector

    I'll try to do shorter exposures next time, thank you. I forgot to mention the even with a 40mm eyepiece I can see the reflection on bright objects. Is there a way to avoid this, maybe using a filter or is this problem unavoidable?

 

 

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