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Thread: proper GEM

  1. #1
    rock mananov's Avatar
    rock mananov Guest

    Default proper GEM



    What is the minimum I have to spend to get a sturdy, well made GEM to do
    necessary tracking for deep sky object astrophotos? I suspect 1000-1500.



  2. #2
    William R. Mattil's Avatar
    William R. Mattil Guest

    Default proper GEM

    rock mananov wrote:

    The tracking isn't the problem. Generally it must be guided ........
    very few mounts can do 10 to 20 minute unguided exposures.


    Bill


    --

    William R. Mattil

    http://www.celestial-images.com

  3. #3
    Anthony Ayiomamitis's Avatar
    Anthony Ayiomamitis Guest

    Default proper GEM

    On 10 Öåâ, 16:24, "rock mananov" <r...@nospam.com> wrote:

    One big unknown is the image scale you plan to use and which impacts
    the route you pursue and in addition to all of the other variables.

    Anthony.

  4. #4
    Ian Tosh's Avatar
    Ian Tosh Guest

    Default proper GEM

    rock mananov wrote:

    Have a look at this page with lots of astronomy information including a
    link to measurements of the periodic errors in various cheap & expensive
    mounts.

    http://demeautis.christophe.free.fr/


    regards

    Ian

  5. #5
    lal_truckee's Avatar
    lal_truckee Guest

    Default proper GEM

    On 2/10/10 9:22 AM, Ian Tosh wrote:

    good stuff - thanks for the link.

    (my french is rusty, but google translator does a pretty good job for us
    insular americans, except for translating "mount" as "horse" in some
    places; not a bad choice, actually.)

  6. #6
    rock mananov's Avatar
    rock mananov Guest

    Default proper GEM

    IT's IN FRENCH !!


    "Ian Tosh" <ian.tosh@stfc.ac.uk> wrote in message
    news:hkupvs$2v9$1@south.jnrs.ja.net...



  7. #7
    Ian Tosh's Avatar
    Ian Tosh Guest

    Default proper GEM

    Try selecting English from 'Google Translate' at the top of the page
    (needs scripts enabled).

    http://demeautis.christophe.free.fr/

    rock mananov wrote:

 

 

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