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  1. #1
    shawn o'deal's Avatar
    shawn o'deal Guest

    Default expanse eyepieces



    what are your opinions on these. i use plossels now. will they enrich my
    viewing experience, or should i hold out for a teleview eyepiece...
    thanks
    john



  2. #2
    Mark & Roslyn Elkington's Avatar
    Mark & Roslyn Elkington Guest

    Default expanse eyepieces

    Go the 20mm, for use with a GS 8-inch f/6 dob. Soft towards the edges,
    enough to be annoying when panning around, and fiddly off axis. I dream at
    night about Panoptics, as you do, but it's become my 75% of the time ep.

    But nice sharp and contrasty views within a goodly fraction of the 66 degree
    WA field makes it a very worthwhile step up from a plossl IMO. A guy from my
    club was showing around his 20mm Expanse to hardcore TV users (on long
    scopes) and got favourable verdicts. I don't think they were just being nice
    :-)

    And then there's the price, which somewhat simplified the decision-making
    process for me. I guess I've yet to be convinced that spending say double
    the cost of my scope on ep's to go from 90% to 98% views is better value
    than adding another 4 inches of aperture instead (several qualifiers apply
    to that statement to leave me some back-tracking and de-egging room as
    required :-)

    Cheers,
    Mark



  3. #3
    Jon Isaacs's Avatar
    Jon Isaacs Guest

    Default expanse eyepieces

    >what are your opinions on these. i use plossels now. will they enrich my

    These are available from several sources under several names but they are all
    made by Synta in China.

    I have the 15mm, 9 mm and 6 mm eyepieces and I am very happy with them. Prior
    to these I was using a collection of Plossls and Orthos including some UO
    orthos and Ultima plossls.

    However I rarely use anything else now, I think these are a definite upgrade
    from the Plossls.

    My eyepieces are from the first batch, the 6 mm has some ghosting problems with
    bright objects that are near the edge of the FOV but apparently this has been
    fixed, at least according to Rod Mollise.

    The 9 mm is really quite an amazing eyepiece, the best of the lot. The 15 mm
    is like a Widefield Plossl though it is probably an Erfle.

    I am going to buy the 20mm here soon and I am going to buy it from
    www.scopestuff.com who sell them for $39 and that includes shipping.

    jon

  4. #4
    Brian L. Rachford's Avatar
    Brian L. Rachford Guest

    Default expanse eyepieces

    On Sun, 16 Nov 2003 07:18:52 GMT, shawn o'deal penned:

    I have the whole set (20mm, 15mm, 9mm, 6mm) and like 'em. As
    others note, they aren't particularly sharp at the edges, but
    still work quite well over most of the field. The increase from
    the size of a Plossl field to the Expanse field is considerable.
    My telescope is a 6" f/8, and at that relatively large focal
    ratio, my scope is more tolerant of inexpensive eyepieces. The
    Expanses are inexpensive enough that buying one or two doesn't
    really financially affect putting together a future
    Radian and/or Panoptic and/or Nagler collection.

    Brian Rachford


  5. #5
    Tom Hole's Avatar
    Tom Hole Guest

    Default expanse eyepieces


    "shawn o'deal" <shawn.odeal@gte.net> wrote in message
    news:wxFtb.59289$p9.39221@nwrddc02.gnilink.net...

    John,

    I have a 9mm Expanse (actually a pair) that I have compared to a 10.5mm
    Pentax XL, a 10mm Sirrius plossl, an 8mm Edmund RKE, a 9mm UO ortho and a
    9mm Nagler tpye 6. I bought the first Expanse in Feb of this year and the
    second in August. My scope is a 10" f/4.7 Orion XT10.

    Both of my 9mm Expanses are a bit picky about eye placement and tend to
    blackout a lot. After some training, it becomes tolerable except on the
    moon. They are almost unusable in my binoviewers because 1 eye is tricky,
    but 2 is nearly impossible. I have read reports of the other focal length
    Expanses being less and more bothersome than others. There may be a
    variation amongst the Expanse line and also between Expanses of the same
    focal length. Mine appear to perform identically in all regards.

    For planets, I think all of my other ep's are better than the 9mm Expanse.
    It has a lot of internal reflections and that leads to poor contrast. I
    would classify my 2 Expanses as acceptable only for casual viewing of
    planets where you only want to take a peek between DSO hunting. I have read
    reports of folks bloackening edges, thus decreasing the scattered light, but
    I have not tried this.

    For deepsky, the Expanse is adequate in my telescope. This is where the
    f/4.7 part seems to be troublesome for the Expanse. I felt the image held
    up well out to 50 deg and that extra 16 deg was a nice filler, but not
    sharp. In a slower scope, this may not be an issue at all. This is not to
    say the Expanse should be avoided, just something to consider. The 2" 32mm
    UO Konig II ep that I had looked similar and I was happy with it vs spending
    $600 for the 31 Nagler (although I certainly wouldn't turn that down as a
    stocking stuffer).

    So, for me and my telescope, I must pass on the Expanse series. If you have
    a slower telescope, they are worth a look. Can't hardly go wrong with
    Orion's guarantee.

    Clear skies,

    Tom



  6. #6
    Jon Isaacs's Avatar
    Jon Isaacs Guest

    Default expanse eyepieces

    >Both of my 9mm Expanses are a bit picky about eye placement and tend to

    I have never experienced this.

    I also find them to be decent planetary eyepieces, I prefered them to the UO
    orthos that I had because on axis they seems similarly sharp and they work much
    better with a DOB because of the FOV.

    I do use them most of the time with a Paracorr but they seem fine without.


    I have been quite happy with mine in F5 and slower scopes as well as my F4
    scope with a Paracorr.

    jon


  7. #7
    Starstuffed's Avatar
    Starstuffed Guest

    Default expanse eyepieces

    "shawn o'deal" <shawn.odeal@gte.net> wrote in message
    news:wxFtb.59289$p9.39221@nwrddc02.gnilink.net...


    I am 95% pleased with my 6mm Expanse and remained 100% satisfied until my
    telescope found its way to NGC404. When positioning Beta Andromedae just
    outside of the FOV so as to optimize the observation of 404, a long "finger"
    of light extended into the field of view from the direction of the star and
    into the DSO.

    Immediately replacing the Expanse with an almost 30 year old cheap and
    generic orthoscopic EP resulted in an unobscured view of the galaxy.

    That being said, instances like the one I mentioned do not come up often
    enough for me not to highly recommend the Expanse. It is a great value and
    serves well in disabusing many who may have thought good and wide field
    views could never be had at a such a low price.
    -------

    Martin
    To reply remove "ilikestars" from my email address



  8. #8
    Jon Isaacs's Avatar
    Jon Isaacs Guest

    Default expanse eyepieces

    >I am 95% pleased with my 6mm Expanse and remained 100% satisfied until my

    Mine does exactly the same thing and of course does a similar thing on the
    planets.

    I bought mine when they first came out, since then Rod Mollise has bought one
    and said that it did not suffer any problems when a bright target is near (or
    past) the edge.

    I am hoping they have taken care of this issue and I am considering buying
    another one from Scopestuff ($39 shipped) to find out.

    How long ago did you purchase yours.

    jon

  9. #9
    Shneor Sherman's Avatar
    Shneor Sherman Guest

    Default expanse eyepieces

    jonisaacs@aol.com (Jon Isaacs) wrote in message news:<20031116110537.11646.00000283@mb-m22.aol.com>...

    I completely concur with Jon's comments (although I have never used
    them with a Paracorr). I have a pair, have used them individually and
    in a Denkmeier binoviewer with my 22" f/4. Excellent eyepiece, beats
    the 9mm Nagler Type 1 in everything but apparent field of view.
    Clear skies,
    Shneor Sherman

  10. #10
    Tom Hole's Avatar
    Tom Hole Guest

    Default expanse eyepieces


    "Shneor Sherman" <shneor@my-deja.com> wrote in message
    news:9dedb1fb.0311161450.97b974d@posting.google.co m...
    news:<20031116110537.11646.00000283@mb-m22.aol.com>...
    the UO
    work much
    without.
    F4

    Shneor,

    Wow, I would not have expected that in an f/4 telescope. Glad they work
    well for you.

    The Expanse series is certainly a lot easier on the wallet than a pair of
    Naglers. You could get 4 pairs of the Expanse for about the same price as
    1 Nagler. That certainly has merit.

    Clear skies,

    Tom



 

 
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