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  1. #11
    Axel's Avatar
    Axel Guest

    Default The emperors new Naglers



    > "Perfect focus right up to the edge"

    SCTs have curved focal planes unless you use a field flattener. So
    the above issue is actually inherent in your SCT.

    Ritesh

  2. #12
    Edward's Avatar
    Edward Guest

    Default The emperors new Naglers

    Yeah, type in haste and regret in leisure...thanks Jon.

    Ed


    "Jon Isaacs" <jonisaacs@aol.com> wrote in message
    news:20031104164953.06012.00000114@mb-m28.aol.com...
    Ratio" and



  3. #13
    Mitch Alsup's Avatar
    Mitch Alsup Guest

    Default The emperors new Naglers

    steve_beats@hotmail.com (justbeats) wrote in message news:<8bdaa68.0311040844.54fb9356@posting.google.c om>...

    It is obvious that you have experience with optics that are close to
    perfection, many of the reviewers have never looked through optics of
    this quality and thus have no way to know how far from perfect any
    given set of optics actually is. I have looked through some $10K-$20K
    microscopes (you need optics this good to drop a microprobe on a 0.5
    micron wire on a silicon chip.)

    It is the same problem when a person tries to project what a real
    luxury car is like when the best car they have ever been in is a
    cadilac!

    I see all sorts of optical issues with various EPs and scopes. Once I
    understand what the EP or scope is and is capable of, I look through the
    optics and enjoy the image. You should too.

  4. #14
    David Knisely's Avatar
    David Knisely Guest

    Default The emperors new Naglers

    steve_beats@hotmail.com (justbeats) wrote in message news:<8bdaa68.0311040844.54fb9356@posting.google.c om>...

    justbeats wrote:


    This is *barrel distortion*, not pin-cushion. Thus, the claim of "No
    sign of any pin-cushion distortion" is accurate. Many eyepieces show
    some pin-cushion distortion (the 31mm Nagler in particular when used
    at short f/ratios), but as an aberration (at least to me), it is less
    troublesome than the astigmatism which many eyepieces show, especially
    at shorter f/ratios.


    Reviews are rarely well-balanced, so there are no "absolutes" (other
    than perhaps the satisfaction of the owner, which often tends to
    contaminate some reviews making them a bit too positive). Mine tend
    to be a bit more in-depth, although I do occasionally miss a few of
    the "downsides" of some eyepieces when I review them.
    The very good performance of the Naglers is most obvious at
    shorter f/ratios, where other less-complex eyepieces tend to show
    horrendous astigmatism or other aberrations. The Naglers tend to show
    much less of this, so the "impression" of good to excellent sharpness
    over much of the field is pretty much justified. I noted in an 8 inch
    f/5 Newtonian that the 20mm Nagler and the 14mm Meade Ultrawide (both
    very good eyepieces) show some an aberration known as "lateral color"
    (a sort of "radial" chromatic aberration) right at the *very* edge of
    their fields, as the stars are stretched into tiny but very short
    rainbows all pointing towards the center of the field. Still, I do
    like their performance. The key item to remember is that reviews are
    somewhat subjective and what is bothersome to one person may be
    something that another can easily live with. Clear skies to you.
    --
    David W. Knisely KA0CZC@navix.net
    Prairie Astronomy Club: http://www.prairieastronomyclub.org
    Hyde Memorial Observatory: http://www.hydeobservatory.info/

    **********************************************
    * Attend the 11th Annual NEBRASKA STAR PARTY *
    * July 18-23, 2004, Merritt Reservoir *
    * http://www.NebraskaStarParty.org *
    **********************************************

  5. #15
    Michael A. Covington's Avatar
    Michael A. Covington Guest

    Default The emperors new Naglers


    "David Knisely" <KA0CZC@navix.net> wrote in message
    news:98b52353.0311041835.6b469113@posting.google.c om...


    It also depends on your eyes. My Pentax binoculars have very different
    optical behavior when I wear my glasses (with binoculars focused for normal
    eyes) than when I take my glasses off and focus them to correct for my
    nearsightedness. They are much better in the first case.



  6. #16
    Chuck Taylor's Avatar
    Chuck Taylor Guest

    Default The emperors new Naglers

    "David Knisely" <KA0CZC@navix.net> wrote in message
    news:98b52353.0311041835.6b469113@posting.google.c om...
    news:<8bdaa68.0311040844.54fb9356@posting.google.c om>...

    ?????
    (1) This is barrel and not pin.

    (2) Therefore there isn't any pin-cushion

    (3) It has pin-cushion.

    #2 and #3 seem to conflict with each other.

    Clear Skies

    Chuck Taylor
    Do you observe the moon?
    Try the Lunar Observing Group
    http://groups.yahoo.com/group/lunar-observing/



  7. #17
    Chuck Taylor's Avatar
    Chuck Taylor Guest

    Default The emperors new Naglers

    "Chris1011" <chris1011@aol.com> wrote in message
    news:20031104141434.11816.00000185@mb-m01.aol.com...

    really
    etc.
    the

    I remember reading someone's posting in another location. I believe the
    scope was a second-hand TV petzval. I believe he was quoting something from
    Al about how he had now purchased the ultimate eyepiece testing equipment
    available! ;-)

    equipment.

    Or separate it from aberrations in the scope.

    Of course, some just don't get it. It wasn't that long ago that I read an
    eyepiece review stating that Edmund RKE eyepieces gave the best performance.
    IIRC, there was an impressive list of telescopes that he had supposedly
    compared these eyepieces on.

    Clear Skies

    Chuck Taylor
    Do you observe the moon?
    Try the Lunar Observing Group
    http://groups.yahoo.com/group/lunar-observing/




  8. #18
    Michael A. Covington's Avatar
    Michael A. Covington Guest

    Default The emperors new Naglers


    "Chuck Taylor" <chucktaylorNOMORESPAM@speakeasy.fishing> wrote in message
    news:VoGcnb0yddFDHjWiXTWc-g@speakeasy.net...

    Or in their eyes.

    performance.

    Maybe he had RKE eyes

    Individual differences do matter. The human eye has spherical aberration;
    not the same amount for everybody.



  9. #19
    justbeats's Avatar
    justbeats Guest

    Default The emperors new Naglers

    jonisaacs@aol.com (Jon Isaacs) wrote in message news:<20031104123044.01555.00000174@mb-m11.aol.com>...

    I agree with the sentiment jon, but when you're socked in with cloud
    for over a week, the mind turns to other diversions. Like
    participating in an interesting discussion on saa...

    Cheers
    Beats

  10. #20
    Nagas Larc's Avatar
    Nagas Larc Guest

    Default The emperors new Naglers

    Congratulations on a clever and apt subject line!

 

 
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