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  1. #1
    Phil Wheeler's Avatar
    Phil Wheeler Guest

    Default Eye Piece for planetary viewing



    Joe Smith wrote:


    I assume you mean a 9mm plossl above. Seems like that, barlowed, would
    give you 4.5 mm. So "better" in what way .. since the list above is not
    much more powerful than what you have.

    Phil

  2. #2
    Joe Smith's Avatar
    Joe Smith Guest

    Default Eye Piece for planetary viewing

    I have an 8" Dobsonian with a 48" (1219mm focal lenght) and want a better
    eye piece for planetary viewing. Currently I use a 9" plossl, both alone and
    with a 2X Barlow. I would like something a little better at the high power
    end. I am currently considering the following:

    3.5mm or 4mm Nagler
    3.5mm or 4mm Radian
    TeleVue 3mm to 6mm Nagler

    I'd like opinions on which would be the best, pros and cons. Also if 3.5mm
    would provide too small of an exit pupil.



  3. #3
    Starlord's Avatar
    Starlord Guest

    Default Eye Piece for planetary viewing

    Well first of all, you might find out that you'd be using the high power ep
    a lot less, remember not only do they incress the size of the image, they
    lose light and they also show up any and all movement in the air above you.
    I have a 4.8 neggler and use it a few times a year and mostly in summer
    time. Of my EP's, I find for low power but still good images, my 17mm telvue
    gives good images, the 2nd best is my 12mm Orto from UO, it does about the
    dest mid power.


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    "Joe Smith" <joe@hotmail.com> wrote in message
    news:MqbEf.148883$WH.20310@dukeread01...



  4. #4
    Joe S.'s Avatar
    Joe S. Guest

    Default Eye Piece for planetary viewing


    "Joe Smith" <joe@hotmail.com> wrote in message
    news:MqbEf.148883$WH.20310@dukeread01...

    Check out the University Optics orthoscopic eyepieces -- if you want
    planetary eyepieces, consider their 4mm, 5mm, 6mm, or 7mm orthos. At
    $59.95, these eyepieces are a steal. These four would give you 304X, 243X,
    203X, and 174X, respectively.

    You said you want these eyepieces for planetary viewing. When you look at a
    planet, you really aren't interested in the wide field of vision that you
    get with the Naglers -- you just want a thin slice of the sky. The orthos
    have no eye relief but if that's not a problem, you really can't beat a set
    of the UO orthos for planetary viewing. And at that price, you could get 3
    or 4 of them for what you would pay for one Nagler.
    http://www.universityoptics.com/125inch.htm



  5. #5
    Dennis Woos's Avatar
    Dennis Woos Guest

    Default Eye Piece for planetary viewing

    > You said you want these eyepieces for planetary viewing. When you look at

    While it is true that you often aren't interested in high power and a wide
    fov, yet in an undriven scope (e.g. a dob) having a wide field at high power
    means more observing and less pushing, i.e. it is an ergonomic issue. Also,
    the eye relief of short focal length orthos is awful.

    For higher power observing, we use a 4.8mm Nagler, a 6mm plossl, a 6mm
    Burgess Planetary, and a bunch of eyepieces barlowed. The Nagler is
    excellent, but the eye relief is nothing to write home about. The 6mm
    plossl is a good performer, but eye relief is bad and the fov is only
    slightly wider than an ortho. The barlow route is good, and helps to
    provide ample eye relief. This might be your best bet. Our latest
    acquisition is the 6mm Burgess, and we are impressed with its performance,
    and it has good eye relief and a wide fov. These are being described as
    Radian-like. Note that Burgess also sells a 4mm, a 5mm and a 9mm. We have
    tried out a friend's 3-6 Nagler, and we liked it. However, we didn't like
    it enough to buy one. We thought the view in our 6mm plossl every bit as
    good as the 3-6, except for the 3-6 having better eye relief and, of course,
    the convenience of the zoom.

    Finally, I would try and demo some eyepieces at a star party, etc. Eyepiece
    likes/dislikes are very subjective. For instance, I don't really mind a
    lack of eye relief that much, but I know folks that it really bugs. That
    said, I would get a Burgess - we really like ours.

    Dennis



  6. #6
    Joe Smith's Avatar
    Joe Smith Guest

    Default Eye Piece for planetary viewing

    I can get the power but would like better optics i.e. hopefully a little
    clearer view at the high power. The 3-6mm zoom sounds tempting (although a
    little expensive) if it could provide a better view than the barlowed 9mm
    plossl.


    __________________
    "Phil Wheeler" <w6tuh-ng7@yahoo.com> wrote in message
    news:ntbEf.3652$Jg.553@tornado.socal.rr.com...
    better
    and
    power
    3.5mm



  7. #7
    John Savard's Avatar
    John Savard Guest

    Default Eye Piece for planetary viewing

    On Wed, 1 Feb 2006 17:27:23 -0600, "Joe Smith" <joe@hotmail.com> wrote,
    in part:


    A Nagler eyepiece is "the best there is", but not really for planetary
    viewing as such. The conventional wisdom has the orthoscopic eyepiece -
    much cheaper - as the favorite for planetary viewing.

    However, you're noting that you are looking for a 4mm eyepiece. A
    Nagler, with its built-in Barlow, would have usable eye-relief at that
    focal length; a conventional eyepiece, like an Orthoscopic, would not.

    Maybe what you should consider is *another* TeleVue product. They make a
    5X Barlow. Then you could use a 10mm Orthoscopic with it, to get the
    same magnification as you would with a 4mm Nagler and a 2X Barlow.

    John Savard
    http://www.quadibloc.com/index.html
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  8. #8
    Dennis Woos's Avatar
    Dennis Woos Guest

    Default Eye Piece for planetary viewing

    >I can get the power but would like better optics i.e. hopefully a little

    I think this is a common misconception - that a better quality eyepiece will
    make higher power views clearer. It just ain't so, at least not in any
    major way, and I think that you will be disappointed. Of course, this is
    assuming that the eyepieces/barlows you use now are not junk. Good optics,
    properly collimated and aclimated, with good seeing provide good views, even
    with $30 plossls.

    Dennis



  9. #9
    Phil Wheeler's Avatar
    Phil Wheeler Guest

    Default Eye Piece for planetary viewing

    Joe Smith wrote:

    I asked because I didn't know any other requirements. For example,
    wearing glasses, any thing less than 16 mm of eye relief is not good.
    So I tend to collect Lantanum EPs .. which may not be the best optically.

  10. #10
    EP Guy's Avatar
    EP Guy Guest

    Default Eye Piece for planetary viewing


    "Joe Smith" <joe@hotmail.com> wrote in message
    news:MqbEf.148883$WH.20310@dukeread01...


    OH GOD MAN....I can't stand this question. The chances of you or anyone
    telling
    the difference in a big way , marginal at best, is a non sequitur. get an
    Antares or meade X-cel class
    and save your money.



 

 
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