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  1. #11
    William McHale's Avatar
    William McHale Guest

    Default Star test of Orion 100mm ED



    Tim Killian <TJK@notmyrealemail.com> wrote:

    I think sometimes people worry a little too much about the star test. It is
    good if you can refigure the optics yourself or if you want to describe the
    specific problem to a vendor. If you just want to see if your scope is decent
    nothing beats seeing what sort of power it will sustain without image
    breakdown. If it gets above 40X per inch for a scope like the Orion ED
    it is probably safe to assume that the scope is pretty good and stop worrying
    about it

    --
    Bill

  2. #12
    Mike's Avatar
    Mike Guest

    Default Star test of Orion 100mm ED


    "William McHale" <mchale@beast.toad.net> wrote in message
    news:mOKke.11$bF1.1057@news.abs.net...

    This is true, however, just what determines what is a good image is totally
    subjective.
    For instance, can an 80mm semi-apo like the ED80 clearly show the Cassini
    division at say
    80 X's mag?. Or do you have to strain to see the division assuming good sky
    condiions?

    What about trying to image craterlets of Plato on the moon? To me, this is
    a perfect indicator if you
    can see craterlets at say 100 - 120 x's. Splitting a double star that is
    2-3 arc seconds apart seems to be another
    good test.



  3. #13
    Pierre Vandevenne's Avatar
    Pierre Vandevenne Guest

    Default Star test of Orion 100mm ED

    "Mike" <MA@telus.net> wrote in news:TT1le.20724$tt5.8289@edtnps90:


    Could drive a truck through mine, eventhough this is Belgium and Saturn was
    already quite low when I tried. Will try the double double as soon as it
    clears.

    Doesn't mean they're all like this, true.


    --
    Pierre Vandevenne - DataRescue sa/nv - www.datarescue.com
    The IDA Pro Disassembler & Debugger - world leader in hostile code analysis
    PhotoRescue - advanced data recovery for digital photographic media
    latest review: http://www.pcmag.com/article2/0,1759,1590497,00.asp

  4. #14
    William McHale's Avatar
    William McHale Guest

    Default Star test of Orion 100mm ED

    Mike <MA@telus.net> wrote:



    Well I wouldn't really rely on the Cassini division to get a good idea about
    how good the scope is, at least something that is 80mm or larger. 80X is only
    about 25X per inch in that scope, I would be looking for something more like
    how the scope performs at 120-140X.


    Well everything is relative; what would constitute poor performance in a big
    scope might be fantastic performance for a little scope.

    --
    Bill

 

 
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