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  1. #1
    Szaki's Avatar
    Szaki Guest

    Default Ebay 30mm/80deg / 2" eyepiece



    Any one try this 2" 30mm eyepiece, selling on ebay, for $95? It has 80 deg
    field.
    http://cgi.ebay.com/ws/eBayISAPI.dll...category=29954
    Item number: 2979229461

    Any good, seems very cheap?

    Julius





  2. #2
    Dennis Woos's Avatar
    Dennis Woos Guest

    Default Ebay 30mm/80deg / 2" eyepiece

    "Szaki" <szaki10@comcast.net> wrote in message
    news:yy_Mb.48266$xy6.116194@attbi_s02...
    http://cgi.ebay.com/ws/eBayISAPI.dll...category=29954

    This eyepiece (also sold by ATWB), has been much discussed. Do a Google
    newsgroup search. I have one that I got from ATWB, and I like it in our 6"
    f/6 mak-newt and 10" f/5.7 dob. Some folks in our club did a direct
    comparison with an UO 32mm Konig in these scopes, and everyone pretty much
    agreed that it was as sharp and bright as the UO until its fov exceeded the
    UO's, and then it fell off. On the other hand, on the internet many other
    folks have commented very negatively. I have seen them go for as little as
    $75 on Astromart. As always, I would try before you buy.

    Dennis



  3. #3
    Szaki's Avatar
    Szaki Guest

    Default Ebay 30mm/80deg / 2" eyepiece

    So, you mean the edge is not as sharp as the UO's? Maybe, the quality not as
    consistant than other, more expensie brands, that's why it's cheap.

    Julius

    "Dennis Woos" <dpwoos@gmavt.net> wrote in message
    news:1008u2mml29cj56@corp.supernews.com...
    deg
    http://cgi.ebay.com/ws/eBayISAPI.dll...category=29954
    6"
    the
    as



  4. #4
    Dennis Woos's Avatar
    Dennis Woos Guest

    Default Ebay 30mm/80deg / 2" eyepiece

    "Szaki" <szaki10@comcast.net> wrote in message
    news:KZ_Mb.48511$xy6.117505@attbi_s02...
    as

    That isn't what I mean. Mine is as sharp and bright as the Kong up to the
    point where the fov exceeds the fov of the Konig, and then it gets pretty
    bad. Also, I have looked through a couple of them, and I have no reason to
    believe that they are not of consistent quality. There is a long story
    about why it is so cheap - do a google search, and look at the 1rpd website.

    Dennis



  5. #5
    Szaki's Avatar
    Szaki Guest

    Default Ebay 30mm/80deg / 2" eyepiece

    Thaks for the info. As I read more about it, seems it works well with higher
    f/ ratio telescopes, down to f/6. It gets very mushi at the edge at f/4.5.
    This is where the Naglers shine, in large DOBs.

    Julius

    "Dennis Woos" <dpwoos@gmavt.net> wrote in message
    news:100902g62m7m572@corp.supernews.com...
    not
    to
    website.



  6. #6
    james's Avatar
    james Guest

    Default Ebay 30mm/80deg / 2" eyepiece

    On Wed, 14 Jan 2004 01:52:56 GMT, "Szaki" <szaki10@comcast.net> wrote:

    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    You are learning. Not all eyepieces work well in all scopes. Naglers
    are designed to perform in fast scopes.Also you need to know that just
    because the apparnet field of view is real wide does not necessarily
    make it a great eyepiece. Filed of view is but only one parameter of
    many. It does no good to have 80 plus degree field of view if that the
    outer half of the field of view the stars look like color blobs or
    suffer severe astigmatism.

    From what I have read about the eyepiece, it is an Erfle design, not
    sure what configuration (1-2-2 or 2-1-2), and I really question how
    well is performs to 80 degrees. To 70 degrees is about the limit where
    Erfles should be limited to. The only way to get wider field is to
    sacrifice some other criteria such as eye relief or distortion. A 41
    mm fieldstop on a 30 mm focal length eyepiece to me seems a bit wide.
    I would expect something more along 35mm filed stop. Besides in scopes
    faster than F5 the performance degrades more. F6 an slower are better
    for this design.

    james





  7. #7
    matt's Avatar
    matt Guest

    Default Ebay 30mm/80deg / 2" eyepiece


    "Szaki" <szaki10@comcast.net> wrote in message
    news:yy_Mb.48266$xy6.116194@attbi_s02...
    http://cgi.ebay.com/ws/eBayISAPI.dll...category=29954
    one can buy the same eyepiece from Astrobuffet for $75 in its cheapest
    incarnation (I believe no bolt case and maybe slight blems ) . Or a very
    similar one (but not identical) brand new from Apogee , the Widescan 32mm ,
    2" , 70deg FOV for something like $69 .

    Best Regards,
    Matt Tudor



  8. #8
    Timothy Hagner's Avatar
    Timothy Hagner Guest

    Default Ebay 30mm/80deg / 2" eyepiece

    hi
    what about this???

    http://www.iteastronomy.com/products...w.php?p=KoMK80

    seems like UO has their own 30mm 80deg konig for 300$
    does anyone know anything about this eyepiece?

  9. #9
    Engineer Scott's Avatar
    Engineer Scott Guest

    Default Ebay 30mm/80deg / 2" eyepiece

    On Tue, 13 Jan 2004 22:45:50 GMT, "Szaki" <szaki10@comcast.net> wrote:


    I've got a BW Optik 30/80 which is the same eyepiece. In my F7.5 scope
    it's pretty sharp in the center but the outer 1/3 of the field is very
    fuzzy. All the stars around the edge look like Globulars. I guess this
    is OK if you like Globs The coating seems a little heavy in a few
    places though it doesn't seem to have any affect on the view. The eye
    relief is pretty nice. It's not hard to look through.

    It's not a Nagler, but for the price it's OK.

    scotty


  10. #10
    Jon Isaacs's Avatar
    Jon Isaacs Guest

    Default Ebay 30mm/80deg / 2" eyepiece

    >Any good, seems very cheap?

    As others have said, it depends on the scope you are using it with. I have one
    of these eyepieces, for the $95 it is a pretty decent deal.

    I use it in my Pronto for terestrial viewing (birds) and digiscoping because
    the edge distortion is not so noticeable because most often it is out of focus
    because of depth of field issues. The foreground and the background will be
    out of focus anyway. I like it because I am not afraid of damaging the
    eyepiece by holding the camera lens to the glass.


    Astronomy wise, I the Pronto at F6.9, the edge distortion is distracting. In
    an F5, things are significantly worse. It is usable if you can stand the edge
    distortion which starts fairly close to the center, it certainly provides a
    nice wide FOV but it can get ugly at times, especially if there is something
    bright near the edge.

    I found a used TV Widefield 32 mm on Astromart for $140. It has a 66 degree
    FOV. Not as wide as the eyepiece in question but much sharper overall, in the
    Pronto, the entire FOV seems sharp, in my F5 Asian DOB, the edge distortion is
    there but the overall view is much superior to the 30mm 80 degree eyepiece. It
    is even useful at F4.

    Bottomline: Its a reasonable deal for $95 but it is only a marginal eyepiece
    IMHO.

    Got some decent bird images with it though....

    jon



 

 
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