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Thread: got my XT10!

  1. #1
    Jay's Avatar
    Jay Guest

    Default got my XT10!

    Being the impatient sort, I decided not to wait for Santa to deliver a
    scope (plus Mrs. Santa would've had him deliver a Starblast or another

    By the time the scope was setup, it was too dark to do an alignment
    (and was clearly out of whack). No worries.

    Quickly found Mars and pleaides. Mars was a bit of a dissapointment (as
    were other objects) -- it was a an extremely bright salmon/pink/coral
    disk. There appeared to be a lot of wobble/shimmer going on and saw
    virtually no detail. Went back inside, talked with my (visiting)
    parents, went out recently and though there seemed to almost be the
    same amount of wobble/shimmer, there appeared to be somewhat more
    detail, almost a brownish patch. None of this was done with any dark
    adaptation, with my best viewing done having spent 15 mins or so
    outside. Let the wife look at pleiades and she declared "looks no
    better than the binoculars" (she had a point). Not sure if it was the
    lack of dark adaptation or something else.

    A few things...

    1) already called the neighbors, begging them nicely to turn off their
    exterior floodlight

    2) can already tell the difference between the 25mm and 10mm, and wish
    I had a 2" eyepiece

    3) cursed the headlights that come down our road every 15 minutes or so

    Orion is rising now, and the moon should be visible in 45 minutes...
    hope to have better luck soon!

  2. #2
    rat ~(    );>'s Avatar
    rat ~( );> Guest

    Default got my XT10!

    Jay wrote:

    Not necessarily. I bought an XT8 and it was very well collimated right
    out of the box.

    It may be that you need to let the mirror cool a bit more before the
    view will settle down. There are two types of shimmer that you will
    encounter time and time again. One, the shimmer of the atmosphere, that
    which makes the stars "twinkle." The second is from tube currents; the
    heat waves rising off of that 2" hunk of glass at the bottom of your
    telescope tube. Once it cools down to ambient, the "seeing" will
    improve considerably.

    <<Let the wife look at pleiades and she declared "looks no

    I would have to agree with your wife. At about 5 degrees, any telescope
    of size tends to blow that cluster apart to the point where it loses
    its "cluster" appearance. Definitely a better binocular object than
    that of a 10" telescope. You will begin to see this a lot. Different
    instruments are better suited to different types of objects, although
    there are severalt types of instruments that can display most objects

    Good luck, get ready for your neighbors to hate (and ignore) you.
    That's OK the feeling will be mutual.

    You'll get one. Try a 35 mm Panoptic.

    You need to shield yourself from that. However, dark adaptation has no
    effect on Moon, stars and planets. If you can see it naked eye, you
    don't need dark adaptation to get the best views of it through the

    The 10" Orion dob was probably a great choice for a first scope. Good
    luck with it.

    ~( );>

  3. #3
    Jay's Avatar
    Jay Guest

    Default got my XT10!

    Was just goofing around waiting for the moon to rise, swung the scope
    over to Orion, looked in the eyepiece, thought I saw something...
    switched out to the 10mm... orion nebula, in all its monochromatic
    glory! I'm hooked, sign me up. :-D

    Some embarassingly amateur questions:

    1) Will I see more detail in the nebula as it rises further away from
    the horizon?

    2) What type of eyepiece do I need to discern more detail in my 10"
    dob? (currently using the included 1.25" 10mm/25mm)?

  4. #4
    Starlord's Avatar
    Starlord Guest

    Default got my XT10!

    1. Let it cool down and viewing will be better.

    2. Watch your nightly weather report, a front of anykind moving threw always
    screws up the viewing.

    3. aline ... aline. ;}


    The Lone Sidewalk Astronomer of Rosamond
    Telescope Buyers FAQ
    Astronomy Net Online Gift Shop

    "Jay" <> wrote in message

  5. #5
    Starlord's Avatar
    Starlord Guest

    Default got my XT10!

    Do NOT fall into the trap of "Gotta have High Power", for you'll find out
    that to use high power, the night has to be just right, no wind, low humide,
    no upper air movement. All those will make the image the worst you'll ever

    Remember to obay the 50lines of rez law.

    I have a 4.8 1.25 negler that pushs my Babylon 8 scope up to 380 power and I
    have to have a night of 100% still weither to be able to use it. Also the
    higher the power, the faster an objet will move out of the FOV and it'll be
    dimmer too.

    I use a range of from 25mm to 10mm on my scope, for planets I use the UO
    12mm Ortho and for DSO's I use normal Possals.

    Don't get in a big rush, take your time and learn how the night sky operates
    and soon you'll be able to look out and know if it's going to be a good
    night, a fair night, or pure trash and not worth viewing at all.

    Plus LEAVE the scope out in your backyard for night viewing, to move it in
    and out is killing your viewing time as it has to cool off each time.


    The Lone Sidewalk Astronomer of Rosamond
    Telescope Buyers FAQ
    Astronomy Net Online Gift Shop

    "Jay" <> wrote in message

  6. #6
    Esmail Bonakdarian's Avatar
    Esmail Bonakdarian Guest

    Default got my XT10!

    Jay wrote:

    Hi Jay,

    Great choice ..

    In addition to s.a.a., you may want to check out the yahoo
    skyquest group. It's rather active and has a lot of
    enthusiastic XT users :-)

    Esmail (classic XT-8)

  7. #7
    Hilton Evans's Avatar
    Hilton Evans Guest

    Default got my XT10!

    "Jay" <> wrote in message news:1130219527.774174.317970@z14g2000cwz.googlegr

    Dark adaptation is irrelevant for viewing Mars. Its importance
    arises when you are trying to view very faint objects in clear
    dark skies. The wobbling and shimmering is due to local seeing
    and regional seeing (thermally unstable air). Even if seeing is
    good the tube currents of a thermally unequilibrated scope can
    degrade the image.


    Hilton Evans
    Lon -71° 04' 35.3"
    Lat +42° 11' 06.7"
    Webcam Astroimaging
    ChemPen Chemical Structure Software

  8. #8
    RMOLLISE's Avatar
    RMOLLISE Guest

    Default got my XT10!


    Jay wrote:

    A StarBlast is a (relatively) small scope, but one that's useful and
    that has very good optics. Hardly a "P.O.S."

    There are five keys to seeing detail on Mars:

    Seeing (atmospheric steadiness), which you can't do anything about
    other than wait for better conditions. One thing you can do in this
    area, though, is wait until the planet is at least 30 degrees above the

    Magnification: Mars is always small in the eyepiece. 200x is the place
    to start.

    Collimation: Needs to be as dead on as you can get it.

    Cooldown: scope needs to acclimate for at least an hour before critical
    observing if there's much of a temperature differential between where
    it's stored and outside.

    Experience: The more you look, the more you'll see.

    Went back inside, talked with my (visiting)

    Something else. The Pleiades is a BIG object, more suited for the
    binoculars than the scope. A telescope like your XT10 just can't frame
    them very well.

    Rod Mollise
    Author of _Choosing and Using a Schmidt Cassegrain Telescope_

    Like SCTs and MCTs?
    Check-out sct-user, the mailing list for CAT fanciers:

    See: <>
    For Uncle Rod's Astro Blog.

  9. #9's Avatar Guest

    Default got my XT10!

    Jay wrote:

    And Rod Mollise replied:


    Jay said:

    And Rod replied:

    Indeed! And the irony of this is that in the Starblast, the Pleiades
    is ultra-spectacular! Also, the best view I've had to date of the Veil
    Nebula as a whole was in my Starblast. Different scopes for different

    Of course, a 25-mm Plossl isn't giving you anywhere near the maximum
    possible field of view out of your scope. You would indeed get a
    much better view of the Pleaides with a 2-inch widefield eyepiece.
    But still not as good as in the Starblast!

    A propos of Mars, let me stress again something that Rod said.
    When you said that you didn't have time to align your scope, I'm
    not sure if you were referring to collimating the main scope or
    aligning the finder with the scope. Anyway, for viewing the planets
    collimation is CRITICAL. That's true for any scope, and triply true
    at f/4.7, which is quite fast. An eighth turn of a collimation screw
    can be the difference between stunning detail and a fuzzy blur.

    - Tony Flanders

  10. #10
    Roger Hamlett's Avatar
    Roger Hamlett Guest

    Default got my XT10!

    "Jay" <> wrote in message
    Well done.
    The 'wobble/shimmer', is the price we pay for having air to breathe. On
    one night in a hundred, you will get the 'magic' conditions, where the
    weather just happens to give really lovely stable air, and these are the
    ones that will send 'shivers' down your spine, on just what can be seen.
    Generally the shimmer will decline latter in the night. Also the planets,
    will show up any collimation errors, so a careful check on this, may be
    called for, if the image does not improve. Dark adaption really only
    affects the ability to see 'dim' objects, and shouldn't affect what you
    are seeing on the objects so far. However 'cooldown', might well be making
    things worse. Though the Newtonian, cools faster than an SCT for exaple,
    it still takes a while for the mirror to acclimatise, and views will not
    be good, till this happens, even if seeing is not bad.
    Hope you see more soon. :-)

    Best Wishes


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