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Thread: 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP

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    Question 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP



    Hello All,

    I did not want to hijack another thread so thought best to start my own, especially since my level of ignorance is monumental. When I read these other threads, I am completely lost.

    I went to the High Point Scientific Inc website, as I read rave reviews here on them and everything on Amazon looked pretty cheezy, cheap etc, especially based on reviews here. Looking at eyepieces there I immediately decided best to start a thread and ask for help.

    Please help with this problem: I need to buy some appropriate eyepieces/lenses and get them to my home this week, as I want to view Mars at its reddest. I don't understand anything you're saying in the other threads so please just make a recommendation or three. My budget is $200 for as many lenses as I can get, even if that is only one.

    I have a Meade Dobsonian 12" diameter that has been moved across country so many times I no longer have anything except one eyepiece which is inadequate for looking at the moon of all things. I haven't tried to view any clusters with it. It is a Meade QX Wide Angel 26mm fully multi coated. Perhaps something else is missing that causes me not to be able to view the moon with it.

    When I adjust to get to focus, the eyepiece comes all the way out! Probably user error.....

    What should I order from the above website to get the best bang for my money on eyepieces? Am I doing something wrong with the 26 mm such that I cant see the moon with it? Stop laughing please...

    I am 65 years old so my pupil dilation is probably part of the lens eyepiece choice based on reading other threads.

    Also, can anyone direct me to a really concise book to read on telescopes so I can get past this woefully ignorant stage? I am a retired engineer so I know I am educable...probably.

    Thank you very much in advance to everyone.
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    Default Re: 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP

    Yes, exit pupil is key when choosing EPs. Max dark adapted eye pupil is 7mm for someone who is very young and at a very dark site ... mine happens to be 6.1mm so I would never buy an EP that produced an exit pupil over 6mm. Divide the EP focal length by your scope’s focal ratio to get exit pupil. I would recommend staying between 2mm - 5mm. You can go lower than 2mm for high mag viewing on planets or lunar if your local conditions permit ...

    Also, depending on the FR of your scope you may or may not need premium highly corrected EPs. The faster the scope the more important this becomes
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    Default Re: 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP

    Check out this thread to expand some on what Nimitz mentions: Article: What Astronomy Eyepieces should I get for my Telescope?

    Also, if you are under a time constraint, I would suggest ordering from Agena Astro: https://agenaastro.com/

    An excellent vendor and on the west coast too.

    Books? Backyard Astronomer's Guide: https://www.amazon.com/Backyard-Astr...448/ref=sr_1_1
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    Default Re: 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP

    Check how far your collimation screws are in. If those are in too far, that would explain why you have to rack it all the way out and still can't get focus. In that case, loosen the push screws (make sure the pull screws stay engaged so the mirror doesn't tip over when the tube is sideways - which you want it to be when doing collimation work), find out how many turns it takes to get them to the center and get them there. Then recollimate. Best to read up on collimation, such as astrobaby's guide.
    Last edited by CamelHat; 07-29-2018 at 05:56 PM.
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    Default Re: 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP

    so is the 26mm inappropriate for anyone/anything (spying on neighbors or anything less than 50 feet)? It sounds like this 26mm is useless. Is there another piece of equipment I need to buy to under the 26mm I have?

    I don't know what a focal length or focal ratio is. I have a 12" diameter mirror (actually 13") and the barrel is 60" long.

    Should I get both a 1mm and a 2 mm? Or a 1mm and a 3 mm? etc.
    Which one of the HighPoint Scientific eyepeices do you recommend for this telescope?

    Thank you for responding above, especially so fast!

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    Default Re: 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP

    Have you aligned the finderscope to the telescope as well as collimated the telescope?
    If there is an issue with the focuser try to post a couple of pictures so we can see what is happening.

    If you have any questions about the eyepiece article ask here or PM me
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    Default Re: 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP

    thank you CamelHat
    I am reading the astrobaby guide right now. eyes glazing over. I have already collimated once and moved the secondary mirror, so probably things are all screwy...no pun intended.

    I don't know what push and pull screws are. are these on the eyepiece holder or on the secondary mirror? anyway. I will go look at my scope some more.

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    Default Re: 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP

    A 1 or 2mm eyepiece will not work with your telescope, much to powerful.
    And no your 26mm will not allow you to peek at your neighbors unless they are a mile or so away

    Do you have a manual for your telescope? If not is there a name on the side of it besides Meade or a sticker/ plaque with a model number and the telescope information?
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    Default Re: 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP

    Quote Originally Posted by LauraHerdingCats View Post
    thank you CamelHat
    I am reading the astrobaby guide right now. eyes glazing over. I have already collimated once and moved the secondary mirror, so probably things are all screwy...no pun intended.

    I don't know what push and pull screws are. are these on the eyepiece holder or on the secondary mirror? anyway. I will go look at my scope some more.
    Keep reading about collimation until you get it, and keep trying until it works. It's not a big deal but you just can't do this half.


    The 26 mm will probably be one of your best eyepieces for DSOs. For planets you can try a 5 mm but is susceptible to air turbulence so don't expect it to work every night especially since Mars is low at the horizon. On most clear nights I can use my 30, 24 and 9 mm, I can Barlow the 9 mm but not always does it improve the image.
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    Default Re: 12" diameter Meade Dobsonian - need advice on which eye pieces to purchase ASAP

    the initial collimation was performed using the cheapest collimator I could find on Amazon.com that had good reviews: Astromania next generation laser collimator.

    so, I adjusted the secondary mirror at that time to work with the main mirror. have I already caused a problem by using a cheap collimator? And, should I just use this product as a paper weight/recycle into the trash? Do I need to buy a proper collimator?

 

 
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