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  1. #1
    ray801's Avatar
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    Post My tentitive eyepiece setup - need advice



    Hello Everyone!

    Sorry to bring this all up again. I have been reading through all the threads and have learned a lot about eyepieces, but I still have a few questions and wonder if some of you can take a look at the setup I plan to get and let me know if I could change anything. I recently sold my Celestron Skyhopper 8” and am planning to purchase an Orion SkyQuest XT10 Classic Dobsonian. This will be my first telescope with a 2” Crayford. So, I have spent the past few days trying to figure out which eyepieces to order – this is where I need some help. I plan to look at the lower magnitude messier objects – clusters & galaxies, not so much nebulas. I don’t plan to do any astrophotography and although I have a 90mm refractor I would still like to use the Dob for planetary and lunar viewing. I cant quite afford all Tele View lenses right now since I am in the middle of college, although from what I have read they are the best. With cost in mind could anyone please advise me on this tentative setup?

    Orion HighLight 3X Barlow – 5-Element - 2” & 1.25”


    Tele Vue Plossl 20mm 1.25” #08371


    38mm Orion Q70 Wide-Field 2”


    13% Moon Filter



    My biggest questions are about the 2” lenses. It appears that there are not many 2” lenses available any lower than 26” with a few exceptions. I wonder why this is, there must be a good reason why most all high magnification lenses are 1.25”. I’m assuming that 2” lenses have no advantage over 1.25 when dealing in lower magnifications which is why they don’t bother selling them? Anyway I figured I would get the 3x Barlow so I could “cheat” and get almost 100x magnification out of a 38mm and 210X magnification out of my 17mm. I just feel like I am missing something… what’s the max magnification I can get out of a 10” Dob before its shaky or unclear… and what’s the max magnification I can get out of a 2” wide angle lense like the Q70. All advice much appreciated, Thanks guys!

  2. #2
    jeebusroxors's Avatar
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    I'm no expert by far, but I have a 3x barlow and I feel it puts too much difference between eyepieces. You may want to consider a 2x.

    If you can't be swayed, I actually just bought a 2x. I'd be willing to let my 3x go for super cheap. It's the Orion 3x Trimag (only a 1.25").

  3. #3
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    Hi ray801,

    Welcome to Astronomy Forum.
    Did you miss this thread? Sticky: Best of the Eyepiece Forum

  4. #4
    RussL's Avatar
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    Welcome to the forum, Ray. I agree with Jeeb that a 2x Barlow is better. I can't explain it very well, but I've heard that for 2" eyepieces 27mm or so is about the lowest you can go without vignetting. That's why you don't see many lower than that. There are some, however, and I don't know how they work. I've heard some good things about the Orion Q70s. Thinking about one myself. Televue Plossls are great if you can deal with short eye relief on the shorter ones. As for the moon filter, I'd get a varying polarizing filter instead of the 13% filter.

  5. #5
    roverich's Avatar
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    Hi ray ...Welcome aboard the forums ... These guys have some decent prices Agena AstroProducts - Telescopes, Eyepieces, Binoculars and Accessories for the Astronomy Enthusiast with FREE US Shipping as do these guys ScopeStuff But i would stay clear of a 3x barlow ...I have a proxima 1.5x 2in and use it more than my 2x and i cant remember when i used the 3x i have .. You can use a 2x barlow in front of your diagonal and it will be a 3x Barlow ..But not all scopes will be able to reach focus this way...
    Last edited by roverich; 07-02-2009 at 01:31 AM.
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  6. #6
    ray801's Avatar
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    Thanks everyone. I decided to stay away from the 3X as recomended. THANKS FOR THE GREAT ADVICE!

 

 

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