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  1. #21
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    Hi Hernando!
    i have a 1 1/4" 3x barlow by omegon. I tried it on the 3.5mm as well I know I was being funny.
    my 9mm uwa is a 2" so i would need another 2" barlow.
    do you think i should invest in another barlow or a new eyepiece?
    so the problem of lack of sharpness is not related to the build quality of the ep?
    the planets do look small though, i expected better through a 10" dob...
    the moon is amazing with 3.5mm hyperion+ 3x barlow...you can hop from crater to crater

  2. #22
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    Is that the Explore Scientific 2" 9mm the 100-degree EP? If so, I would suggest that you get an Antares 2" 1.6x barlow:


    Antares 2" 1.6x barlow (with Meade SWA 28mm)

    This particular Antares 2" 1.6x barlow is very popular with Ethos owners and has a very good reputation. Applied to your UWA 9mm, the barlow will yield an equivalent of a 5.6mm EP or 214x, a nice magnification to provide a bigger image scale for the planets. When viewing planets you have to concentrate on it for some time to be able to tweak out those additional details during those fleeting moments of atmospheric stability and the more log time you have at the EP, the easier it will be to tease out those planetary details which at first may not be apparent. But am not sure if the barlow will work with your Dob scope, so ask the vendor about this matter before getting one.

    Yeah, pushing ridiculously high magnification can be fun at times and make-believe you're in a space module about to land on the Moon!

    Best,

    Hernando
    Last edited by ibase; 02-09-2011 at 09:52 AM.

  3. #23
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    yes the moon is a very easy target, even with poor weather.

    the eyepiece is Explore Scientific 2" 9mm the 100-degree EP.
    its wonderful
    i didnt know that some barlows cannot work on some scopes...

    i heard that orthoscopic e.p.s are the best for planets?
    what type would you recommend for a 10" dob f-ratio 5 flength 1200?
    is it worth going for a very expensive ep?

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    That ES 9mm 100-degree is a very nice EP indeed, and worth barlowing. Yes, ortho's are sharp and are good for planets but you have to consider that they have very narrow apparent field of views (AFOV), like in the 40's degrees. The problem with that is that if the Dob is non-driven or non-tracking (no motors), the target object will zip very fast (especially for hi-power) across the view and you have to continually nudge the scope a lot of times at short intervals to be able to keep the object centered in the view, where the planets can be seen at its sharpest. With your wide 100-degree EP, life is easier.

    Good orthos are: Baader Genuine Orthos (BGO), University Optics HD, the older Meade Research Grade orthos; as earlier mentioned, 5-6mm should do well with your scope.

    Is it worth going for expensive EP's? There is a saying that the eyepiece is half the scope, and any telescope is only as good as the weakest link in the optical train. Even if one has the best mirror or objective lens but the EP used on the scope is a poor one, the views will not be good at all. Good EP's bring out the best in good scope objectives. And also, telescopes can come and go, but the EP's stay with you and can be used for any other scope that comes in the future, so it's a wise move to invest in good ones. Just my 2 cents.

    Best,

    Hernando
    Last edited by ibase; 02-09-2011 at 10:38 AM.

  5. The Following User Says Thank You to ibase For This Useful Post:

    Canon Pete (02-09-2011)

  6. #25
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    Many many thanks for your help.
    I really appreciate.
    I am quite new to telescopes..
    it was a my dream when I was a child..
    and now i cannot get enough.

    Thanks again

  7. #26
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    Quote Originally Posted by spsaila View Post
    Many many thanks for your help.
    I really appreciate.
    I am quite new to telescopes..
    it was a my dream when I was a child..
    You're most welcome, glad to be of help.

    and now i cannot get enough.
    You're hooked, like the rest of us here. Clear skies!

    Best,

    Hernando

 

 
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