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Thread: Illuminated EP

  1. #1
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    Default Illuminated EP



    Folks

    Rec'd a Celestron 6SE for Christmas. I have a little trouble knowing when a star is in the middle of the eye piece during alignment and was wondering if an illuminated EP would help. I keep thinking a set of cross hairs would help.

    Thanks Mark
    Celestron 6SE with stock finderscope.

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    Default Re: Illuminated EP

    I use this for my scopes. It has double crosshairs and a 70* FOV. Slightly soft around the edges but's used primarily for centering during alignment. The other Agena's offered have either only a single crosshair or narrow FOV.

    Agena 1.25" Wireless Illuminated Reticle Eyepiece with Focusable Dual Crosshair - 20mm
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    Default Re: Illuminated EP

    An illuminated reticle eyepiece certainly helps. Another technique is to defocus the star until it is almost as big as the eyepiece's FOV. It is pretty easy to get it centered then.

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    Default Re: Illuminated EP

    Quote Originally Posted by KathyNS View Post
    An illuminated reticle eyepiece certainly helps. Another technique is to defocus the star until it is almost as big as the eyepiece's FOV. It is pretty easy to get it centered then.
    Never thought of that.
    I will try it next time out thanks.
    KathyNS likes this.

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    Default Re: Illuminated EP

    I use Kathy's trick. One caveat... is some compound scopes will have a bit of image-shift depending on if you are cranking the focus "in" vs. "out". This means if you finish focus by turning the focus knob clockwise for one alignment star... but counter-clockwise for the next star... you can have a bit of error created by image shift. Always "finish" your focus (this only applies to scopes that have image shift) in the _same_ direction.

    I always finish focus by turning my focus knob counter-clockwise because that's the direction that "pushes" the mirror forward. The direction that "pulls" the mirror back risks that the mirror could settle after I focus ... resulting in an unintended change in focus.
    burris likes this.
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    Default Re: Illuminated EP

    Quote Originally Posted by KathyNS View Post
    An illuminated reticle eyepiece certainly helps. Another technique is to defocus the star until it is almost as big as the eyepiece's FOV. It is pretty easy to get it centered then.
    I'm going to try this next time I'm out as well.
    - Rick
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    Thumbs up Re: Illuminated EP

    +1 on defocused star method.
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    Default Re: Illuminated EP

    In your experiences, is it worth getting a retiule/cross-hair eye piece? I currently use the de-focused doughnut method for aligning, but I am weighing up getting a reticle EP; just curious if it was worth it?

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    Default Re: Illuminated EP

    For visual observations the defocused star is good enough. The illumated eyepiece with cross hairs works best for astrophotography
    SXINIAS

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