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  1. #1
    gjritter@gmail.com's Avatar
    gjritter@gmail.com Guest

    Default University Optics 32mm MK-80 - Performance on fast scope?



    I'm looking for a lower-cost alternative to the 31mm Nagler. I'm
    interested in the 32mm MK-80 from University Optics:

    http://www.universityoptics.com/2inch.htm

    I would be using the eyepiece in a 10" f/4.7 dobsonian reflector. Does
    anyone have experience with this eyepiece in a similar scope? How does
    it compare to eyepieces like the 31mm Nagler or the Meade Ultra Wide
    Angle 32mm when used in a fast scope?

    I searched the newsgroup, and found some threads that make mention of
    this eyepiece, but so far haven't found anyone commenting on its
    performance in a fast scope.

    Thanks,

    Greg


  2. #2
    Bob Schmall's Avatar
    Bob Schmall Guest

    Default University Optics 32mm MK-80 - Performance on fast scope?

    gjritter@gmail.com wrote:

    Check with ITE telescopes in Florida

    They are familiar with both in fast scopes and can give you a valid
    comparison.

    Bob

  3. #3
    Rich's Avatar
    Rich Guest

    Default University Optics 32mm MK-80 - Performance on fast scope?



    Do you like seaguls?
    -Rich

  4. #4
    Stephen Paul's Avatar
    Stephen Paul Guest

    Default University Optics 32mm MK-80 - Performance on fast scope?


    <gjritter@gmail.com> wrote in message
    news:1136654439.835852.63930@z14g2000cwz.googlegro ups.com...


    Just some comments to consider in random order....

    The main difference between the Nagler/Panoptic and the MK-70/80, or
    WideScan (and all there ilk) is they have better correction for astigmatism
    in the eyepiece.

    The faster the scope, the closer to center the astigmatism begins in the
    simpler eyepiece designs.

    If you eliminate the astigmatism using a Nagler/Panoptic, then underneath
    you will reveal the coma inherent in a fast parabola. So, unless you also
    buy a Paracorr, there's not a compelling reason to get the 31mm Nagler for
    any parabolic reflector under F6.

    The worse case of course is still the eyepiece that is uncorrected for
    astigmatism used in a fast reflector, which layers one aberration on top of
    another. (In my mind, that's why reflectors suck as RFTs.)

    On the other hand, a fast refractor is (hopefully) corrected for coma. If
    you want a nice unabberated field of view, pop a Nagler or Panoptic into a
    fast refractor. You lose the aperture advantage, but man, are those stars
    nice and sharp across the entire FOV.



  5. #5
    Shneor's Avatar
    Shneor Guest

    Default University Optics 32mm MK-80 - Performance on fast scope?

    I think you would do better with any of the 30mm 80° 2" eyepieces,
    like the 1rpd, the Anacortes Bird's Eye View, the Moonfish, etc. They
    are a bit better corrected for astigmatism, IMO. They are quite
    reasonable at f/5, and I think you will find them usable at f/4.7. Near
    the edge you will certainly notice slightly distorted images. But I
    think these will perform better in your scope than with the UO. In any
    case, you should consider getting a Visual Paracorr to use with this
    type of eyepiece.
    Clear skies,
    Shneor


 

 

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