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  1. #1
    stewe's Avatar
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    Default Orion XX12g pre-purchase doubts



    Hi Folks,

    First of all hi everyone, it's a great pleasure to be a new member of this forum.

    In the past few days, I've enjoyed reading several fine reviews of this 12" mortar I've been considering to buy: the Orion XX12g. Yet I still have a few doubts and I'd greatly appreciate if the owners/users of this instrument could give some further expert advice.

    I'm a bit worried about the sheer size and weight of the telescope. I appreciate that it is meant to be a portable instrument, but "portability" is a rather subjective term. I expect that the PITA caused by the weightlifting-assembly-collimation-alignment sequence will be compensated by a great optical performance and the convenience of the goto system. How realistic is that the aforementioned setup sequence can be completed within an hour? I suppose that collimation will be necessary every time I transport it to the observing site by car, am I right? Also, I would have to disassemble the base unit every time I use the telescope. Is this a lifelike plan? How well will the base withstand the test of time?

    Furthermore, I'd like to ask a few questions about some non-trivial parameters of the telescope:

    - The central obstruction of the secondary mirror seems to be a bit small for an f/4.9 Newtonian system. It's good for high contrast, but how significant is the vignetting of the secondary mirror? Is the secondary's distance from the primary adjustable in any way?
    - How resistant is the instrument to wind, especially with the shroud on? I expect it to be more stable than a similar tube on a GEM, is that correct?
    - Is it possible to easily level the base unit in the field? How susceptible is the GoTo to the levelling accuracy?
    - Probably a stupid question: is there a manual RA/DEC input in the hand controller unit (since object catalogs tend to be inaccurate)?
    - Is the centre of the primary mirror marked for the ease of laser collimation?
    - Has anyone successfully used a DSLR for Moon photography with this instrument? If so, could I get some insight about how that may be achieved?

    I will greatly appreciate if anyone can give answer to any of these questions.

    Best wishes,
    stewe

  2. #2
    skfboiler's Avatar
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    Default Re: Orion XX12g pre-purchase doubts

    I have the XT12g. Therefore, I cannot speak specifically about the XX12g. Hopefully some I’ll someone with that scope will chime in.

    What I can speak on is that it is a quality scope and good workmanship for a mass produced item.

    The base is heavy and what I read about the the XX12g base is collapsable which can aid in transportability.

    As far as leveling, there is no leveling mechanism. The base has 3 short legs. If you have to level, I would add wood shims underneath. My observing sites are not flat but I have yet tried to level and I get good results.

    The Synscan 4 controller does have ability to input RA/DA coordinates. It is pretty accurate as I was able to locate the comet 46P/Wertanen a couple of weeks ago. It was in the field of view of my 24mm eyepiece.

    The primary mirror is marked so that you can get a good collimation.

    I have yet to try astrophotography with my XT12g. I have done it with my 6 inch reflector using my DSLR with a Barlow lens. I can get about 20 maybe 30 second exposers at best. I presume I can get similar results when I get around to attaching my camera to the XT12g.

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  4. #3
    stewe's Avatar
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    Default Re: Orion XX12g pre-purchase doubts

    Thanks for your answer, skfboiler, that was useful info.
    I'm more and more inclined toward buying the XX12g, although I started to have some doubts about having clear skies ever again.. I have not seen the stars for more than a few minutes in about a month! Weather has been just awful in Southern Germany
    I was also considering the XT10g (tube without truss), but since the base cannot be disassembled, I think I would end up with an even bulkier scope compared to the XX12g.

    cheers,
    stewe

  5. #4
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    Default Re: Orion XX12g pre-purchase doubts

    Hello..?
    Any XX12g owners want to share some thoughts..?

 

 

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