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  1. #1
    Longfellow's Avatar
    Longfellow Guest

    Default Eyepiece question.



    Back again for some more opinions.

    Ran across the assertion that Pentax eyepieces are highly regarded, even
    in comparison to Nagler's stuff. As a longtime photography amateur, I
    know and appreciate the quality of their SMC optics (I've still got a
    prized original K 50mm f1.4 that holds its own against... . But I've
    not a real clue about their telescope optics.

    Reason I'm asking is that it is said that the Pentax PF spotting scopes
    are one of the few that were designed around the eyepiece, and that as a
    result, they rival the very best costing thousands more. So my question
    here is this: are Pentax eyepieces indeed widely used and well regarded
    as amongst the best available?

    Opinions and comments, please.

    Longfellow


  2. #2
    FuzzyLogic's Avatar
    FuzzyLogic Guest

    Default Eyepiece question.

    Longfellow wrote:

    I bought the same K 50mm f1.4 on Ebay for astrophotography, but I still
    haven't taken any photographs. Have you got any pictures online made
    using this lens?

  3. #3
    Ed T's Avatar
    Ed T Guest

    Default Eyepiece question.


    "Longfellow" <not@this.address> wrote in message


    Yes, they are. There are probably more TeleVue fans than Pentax fans, but
    they are enthusiastic supporters.

    Ed T.



  4. #4
    William McHale's Avatar
    William McHale Guest

    Default Eyepiece question.

    Ed T <reply@thegroup.thx> wrote:




    I further suspect that the Tele Vues are more popular mostly because of the
    82 degree field of the Nagler. If it was strictly Panoptic versus the
    wide Pentax things might be different.

    --
    Bill


  5. #5
    Michael McCulloch's Avatar
    Michael McCulloch Guest

    Default Eyepiece question.

    On Thu, 26 May 2005 15:05:21 GMT, William McHale
    <mchale@beast.toad.net> wrote:


    Pentax XW series have the advantage of longer eye relief over Televue
    Type 6 Naglers, and have a wider afov than Radians.

    Many eyeglass wearers prefer Pentax for that reason. I can't see the
    full 82 deg afov of a Nagler Type 6 with my glasses on anyway. Even
    the Pan 19 is difficult -- I have to press hard up against the folded
    down eyecup (sold mine for that reason and opted for the Pentax XW
    20).

    ---
    Michael McCulloch

  6. #6
    Malcolm Stewart's Avatar
    Malcolm Stewart Guest

    Default Eyepiece question.

    "Longfellow" <not@this.address> wrote in message
    news:119ak8e655jtgc2@corp.supernews.com...


    Have you tried it at f1.4 ? I have - a big disappointment.
    --
    M Stewart
    Milton Keynes, UK
    http://www.megalith.freeserve.co.uk/oddimage.htm




  7. #7
    Longfellow's Avatar
    Longfellow Guest

    Default Eyepiece question.

    On 2005-05-26, FuzzyLogic <fuzzylogic@hotmail.com> wrote:

    B&W film only; no scans.

    Longfellow


  8. #8
    Longfellow's Avatar
    Longfellow Guest

    Default Eyepiece question.

    On 2005-05-26, Malcolm Stewart <malcolm_stewart@megalith.freeserve.co.uk> wrote:

    Not often. Sweet spot is f5.6. Haven't run color through that rig in a
    long time, and never evaluated it with color film.

    For me, wide open use is for DOF control and I prefer longer focal
    lengths for such work, so haven't had the need to critically assess it's
    wide open performance.

    Longfellow


  9. #9
    AstroHoney's Avatar
    AstroHoney Guest

    Default Eyepiece question.

    f/1.4 lenses at f/1.4 are designed to give you a _usable_ shot, not the
    sharpest shot.

    AstroHoney


    Malcolm Stewart wrote:


  10. #10
    Longfellow's Avatar
    Longfellow Guest

    Default Eyepiece question.

    On 2005-05-26, Longfellow <not@this.address> wrote:
    <snip>

    Thanks for the comments!

    The Pentax PF scopes make sense, then, I would think. IIUC, the
    eyepiece is the real core of the instrument, where a fine eyepiece can
    make a real difference in the performance of an average scope, but an
    average eyepiece can nullify the virtue of the finest scopes. IIUC,
    that is...

    If so, then a scope designed around a world class eyepiece ought to be
    competitive at any price. Guess I'll start saving for a PF.

    Thanks again,

    Longfellow


 

 
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