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  1. #1
    72stick's Avatar
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    Default Orion Expanse EP in XT8



    Hi all,

    New to everything here. I want to know how bad I messed up. We bought an Orion XT8 in July. Wow! What a sweet scope is all I can say. I wanted to increase our EP magnification and ordered an Orion Expanse 15mm and a 9mm.

    After ordering, I read an article that said the 15mm Expanse EP doesn't work well in an fast scopes with F6 ratio or less. I think the XT8 is an f5.6. Is this true and if so, how bad did I mess up?

  2. #2
    andyp180's Avatar
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    Default

    hi and welcome to the forums.
    the focal length of that scope should be
    around 1200mm,making it an f5.9.
    the ep's you mention are a decent ep.
    not high end but they do a decent job,some softening
    at the edge of fov,but nothing too drastic.
    they should work fine in your scope.
    hope this helps.
    clear skies,

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    andy

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  3. #3
    72stick's Avatar
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    Default

    Thanks!

    With the 25mm EP, that came with it, Jupiter was really small and we could just make out 2 bands of clouds. There's no way we could see an Io eclipse with that EP.

    I know these new Orion EPs are not the high end of the scale, but I was hoping we would be able see the planets better and some DSO.

  4. #4
    andyp180's Avatar
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    Default

    they will do a fine job.
    the secret is to locate with the 25mm,then pop
    in either the 15mm or 9mm.
    the 9mm will give you you good views on a good viewing
    night.
    be aware though,that higher magnification will lose you some
    clarity.
    dark adapted eyes and some practice will have you resolving
    more detail as time goes by.it is a learning curve.
    a 2X barlow would effectively double your range of ep's too.
    hope this helps.
    clear skies,

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    andy

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  5. #5
    FRANKB's Avatar
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    Default

    I have both of those eyepieces,and they work great with my XT6.I probably use the 9mm the most.They also both work well with 2x barlow

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    Default

    +1 Frank and Andy ... I've see plenty of transit shadows on Jupiter with my XT8 with a barlowed 10mm plossl. Those EPs show work fine. I'm in a near red zone light polluted area here as well. It all come down to contrast. Good collimation and steady air are far more important for view that kind of detail. I think you'll get lots of use from those EPs.
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  7. #7
    72stick's Avatar
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    Default

    Very cool!

    Now, I really can't wait till they arrive.

    We had a few cool clear nights in the last couple of months that really showed the potential of the XT8 and on one of those nights I saw an amazing event.

    While I was giving my eyes a break from hard focusing I caught movement in the sky just to the right and a little below Polaris. The object wasn't lit up. It was just a little lighter grey/black than the sky around it. I moved the dob around to where it appeared to be traveling and looked in the EP. I think it was an asteroid. It went by really fast and took up the entire field of view.

    Last Friday night at the McDonnell planetarium in STL we attended our first star party. Very interesting, but they only had one table top scope set up outside. The line of kids was long so we didn't want to waste their time on a couple newbies like us. We live several hundred miles from STL and our sky is less light polluted than STL anyway.

    We learned a lot about finding interesting stuff to look at with the XT8 while we were at the planetarium, we just need another cool clear night and our new EPs to put that knowledge to work.

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    Default

    I had both EPs when I got mine. You should be just fine and they will make a great addition to your XT8. You will get a lot of use out of each one, so relax and enjoy.
    Clear Skies,
    Tim
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