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Thread: Eyepieces for a 12 inch Orion Dobsonian

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    Talking Eyepieces for a 12 inch Orion Dobsonian



    Hi!
    I've recently upgraded my telescope to a 12 inch Orion open truss dobsonian. Took me a month to figure out the nuances of this giant. I finally took it out last night for the 1st time and I have a couple of doubts regarding eyepieces. Which should I use with this telescope for viewing planets?
    All my eyepieces are budget celestron ones excluding the Baader Hyperion. I want to make do with the current eyepieces I have because I don't have the budget to buy new ones. Currently I have a 6mm, 10mm, 15mm, 32mm (all celestron), a deepview eyepiece from Orion and the Baader along with a 2x Barlow.

    And on another note; how often (if ever) do you clean the primary mirror? In a month (even with the dust cap on 24x7) the primary mirror has got a thin layer of dust. After reading up a little I realised that it's not advisable to clean the mirror and that some dust doesn't make much of a difference. Does it?


    I would highly appreciate any help on the topic.

    Thank you kindly,


    Div

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    Default Re: Eyepieces for a 12 inch Orion Dobsonian

    Hello and welcome DivyaD
    I am not sure what style your Celestron eyepieces are but I will assume from the focal lengths they are Plossl eyepieces.
    Good Plossl are actually good to f/4 but you have the 50° AFOV. You would probably benefit from some eyepieces with large AFOV with your new scope.
    If the mirror is getting dirty you will see the view degrading. The old saying if your not sure wait a year is fairly accurate.
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    Default Re: Eyepieces for a 12 inch Orion Dobsonian

    Hi Div!

    For planets, I would stick with your 10mm and 6mm eyepieces, or you could even barlow your 10mm on nights with steadier seeing.

    As for your mirror, the best advice is to not worry about it.

    I have used my 12" dob (though mine is a solid tube) for the past 3 years and in that time I have only cleaned my primary mirror once, and that was in March of 2016.

    Most importantly, never shine a flashlight onto the primary mirror. It will just freak you out needlessly. Out of sight, out of mind, as it were.

    Do you at least have a shroud to use with your scope? This can not only block stray light from getting to your primary, but can also help mitigate dust and debris from getting on the mirror.

    A little dust and dew marks will not impact the view to any noticeable effect.
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    Default Re: Eyepieces for a 12 inch Orion Dobsonian

    Thanks for the input Bryan!
    I will try the 6mm and the 10mm on Jupiter tonight.
    I'm glad to hear that a little dust is of no worry. And yes I did shine a flashlight on the primary mirror and was absolutely flabbergasted by the amount of dust I saw. Never doing that again!

    And yes I did purchase a shroud. But as the shipping and customs in India is rather time consuming, the shroud has been "in transit" for the past 3.5 months. Hope to have it here by September.

    Thanks again!

    Clear skies

    Div
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    Default Re: Eyepieces for a 12 inch Orion Dobsonian

    Thank you Gabby,
    I'll try out some of the eyepieces with a larger AFOV tonight.
    "If you're not sure wait a year" sounds accurate! I'll keep that in mind


    Clear skies!

    Div
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    Default Re: Eyepieces for a 12 inch Orion Dobsonian

    Shining a flashlight on your mirror is alot scarier than a spooky house on Halloween.
    He has passed on his legacy to his daughter as of 09/26/2017.
    Now he views the stars closeup.
    "If people would look up into the night sky as intently and as passionately as they do their phones, they would be amazed"
    >)))))*>

 

 

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