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  1. #1
    powerwindows1985's Avatar
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    Default Orion Expanse Eyepiece



    Does anyone out there own any of the Expanse eypieces? I am considering buying one and want to be sure they are worth it. Also which one should I get the high power 6mm or the mid power 15mm (I have a 25mm and 10mm Plossl). Any info is appreciated.

  2. #2
    Vinnie's Avatar
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    G'Day Mate,

    I have two EP's here, one 6mm and one 9mm that spec the same as the Expanse, ie 66degree AFOV approx 13mm eye relief on the 6mm and about 15mm on the 9mm (mine have a "house" brand but are quite likely the same EP' as the expanse)

    They are quite reasonable EP's and at the better end of the budget range. The couple of dollars more over the price of a standard Plossl is worth it for the bit wider AFOV. Mind you, these are not Hyperions or LVW's, but are a lot cheaper.

    Before firmly recommending any EP, however, I need to know what scope you have.

    Vin

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    powerwindows1985's Avatar
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    Default

    thank Vinnie:

    Forgot to mention the scope I use. I have an Orion XT6 dob.

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    Default

    OK,

    So the XT6 is a 150 x 1200 f/8 Newt

    That's actually quite a flexible sort of scope as you can run up to higher mags, given the focal length, without going to really short F/L ep's that rob you of eye relief

    This scope should be able to run up to 300x without too much coma or loss of resolution but you should realise that with almost any scope, jumping higher than 200x will really depend to a huge amount on the conditions of where you are. eg Light pollution, atmospherics, air pollution etc. Even under the best apparent visual conditions the atmosphere is working against you with all sorts of jetstream currents, thermals, you name it.

    Also we talk about the "sweet spot" which is the maximum mag of a given scope that gives you clear viewing under most conditions.

    I would expect that you would be looking at somewhere between 150x and 200x to be in that zone.

    Given the above ravings, I would go for the 6mm Expanse to run at 200x and my next purchase after that would be a reasonable 2x barlow so that your 25mm plossl becomes a mid range at 12.5mm, and you can try the 10mm at 5mm equivalent for when you get better than average nights

    HTH

    Vin

  5. #5
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    Thanks for the info Vinnie. I actually do have a 2x barlow. Haven't had good enought conditions to use it with the 10mm yet (works well with the 25mm though).

 

 

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