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  1. #1
    neal_mlc's Avatar
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    Default what the heck is a



    bird- jones?????
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  3. #2
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    Default

    I presume the name comes from its designer.

    It resembles a Newtonian, but the mirror, instead of being parabolic, is spherical, with a short focal length. The spherical aberration is corrected by a lens in the focuser, which also acts as a barlow, doubling the effective focal length.

    From what I've read, the true Bird-Jones design calls for the corrector to be between the primary and the secondary, but in practice, it is always in the focuser.

    They are apparently quite reasonable scopes. I've never tried one. The advantage is the short tube. The main disadvantage is that they are a b*tch to collimate.

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  5. #3
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    thank you very much!
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  6. #4
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    Default

    Thanks for this question....was wondering myself lol.

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    Default

    However-- many people have trouble collimating this style of telescope. It has a barlow lens built in--- unlike a regular reflector which does not have one.

    Personally I would stay away from this design for your first telescope. Just my opinion of course.

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  8. #6
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    Default

    Well I(KIND OF) disagree on them being a .. B*tch .. to collimate...

    Its normally quite easy to just remove the internal lens from the focus tube..collimate as you usually would with a regular Newtonian.... then replace the lens (correct side facing the secondary mirror )...

    This will get you so darn close to being in perfect collimation with the lens in place...

    I owned a Celestron 114 GT that was a Bird Jones design and PERSONALLY never had a problem with collimating the darn thing...nor did I find the views lacking

    Bob G.
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