Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1
    jamie's Avatar
    jamie Guest

    Default Problem with my new celestron astromaster 114 newtonian telescope.?



    My garandpa and I were looking at saturn a few nights ago and we saw it as a dark ring with light around the outside. Now today we were looking at mars and it appeared as the same thing.

    The dark ring is identical to the secondary mirror which is in the front of the telescope. That is what I'm seeing.

    Maybe it isn't colminated. My grandpa hinks that the companies, sent me bad lenses but I think he has no Idea what he is talking about.

    Sorry if I didn't explain it right.
    I am able to get the image to come together to one point, but I'm not able to observe any detail on the planet. I will try again tommorow night.

    So all I do is play w/ the focus knob until it is right?

  2. #2
    RussL's Avatar
    RussL is offline Guest
    Points: 15,907, Level: 87
    Level completed: 2%, Points required for next Level: 343
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Join Date
    Nov 2008
    Location
    Cayce, South Carolina
    Posts
    1,931
    Points
    15,907
    Level
    87
    Thanks
    220
    Thanked 353x 209 Posts

    Default

    Well, let's see, looks like your question has been on here for awhile. The "dark ring", as you say, is it more like a dark SPOT? It does sound like the secondary mirror shadow. Try this: put in your lowest power, the one with the biggest number on it (what is it, by the way), start with the focuser turned all the way in, then, while looking through the eyepiece at a distant object slowly turn the focuser out and pay attention to what the image does. You'll know when and if it gets focused. If the image never comes to focus by the time you reach the end of the focuser travel, I'd say call Celestron and ask them what they think. Otherwise, your collimation could be way off, but if it's that far off you might not be seeing the secondary at all. But even if collimation is off, if it's not too bad you can still come to reasonable focus. You just might not get the clearest image.

    Bear in mind that a reflector telescope is prone to show the shadow of the secondary mirror on bright objects under mainly two conditions: 1) when out of focus and 2) when using very long focal length eyepieces (bigger numbers).

    Just in case, hold your eyepieces up to your ear and give them a shake to make sure they don't rattle inside.

    That's about all I can think of. Good luck.

    --Russell

  3. The Following User Says Thank You to RussL For This Useful Post:

    gabep88 (09-30-2012)

  4. #3
    FatherGuse's Avatar
    FatherGuse is offline HYPER GIANT
    Points: 14,603, Level: 83
    Level completed: 30%, Points required for next Level: 247
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points365 Days+ Registered Achievement!200+ Posts Achievement!
    Join Date
    Nov 2008
    Location
    Tarheel State, USA
    Posts
    2,027
    Points
    14,603
    Level
    83
    Thanks
    185
    Thanked 187x 147 Posts

    Default

    ... love this scope btw ... Jamie, hope you got it sorted out ... or if you ever check back in, let us know what was going on??


    EDIT 2/26/09 ... been wrestling with mine lately ... starting to have a slight change of heart for this scope (now that I have some other scopes to use) ...
    Last edited by FatherGuse; 02-26-2009 at 05:17 PM.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Bill - "Recreational 'Stronomer" and "Astro-Junk User" ... EGO lego , proinde EGO operor ...

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  5. #4
    Zalmond's Avatar
    Zalmond is offline White Dwarf
    Points: 7,194, Level: 59
    Level completed: 22%, Points required for next Level: 156
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!2 Posts Achievement
    Join Date
    Feb 2009
    Location
    upstate
    Posts
    11
    Points
    7,194
    Level
    59
    Thanks
    1
    Thanked 2x 2 Posts

    Default AstroMaster (Moderator Edit)

    Pretty much agree with Russell. I have one here that a customer brought in "will not focus".

    And indeed it will not. This is another Bird-Jones Newtonian. It uses a teleextender mounted in the focuser tube to double the focal length of a very fast spherical primary mirror.

    IMO this new model is a disaster. The EQ-1 mount is not well designed and doesn't have the capacity to carry the optical tube. With the two counterweights provided the tube cannot be balanced. There is way too much flex at the hub leg juncture and in the legs themselves.

    They let the plastic engineers go wild. As a result the focuser is integrated with the front cell/secondary carrier so as to make collimating it very difficult.

    The secondary carrier has oversized spider legs and hub making for an unecessary secondary obstruction.

    The primary cell has two plastic straps that come halfway up the tube and prevent the rings being postioned so as to balance the tube. Also the cell cannot be removed to spot the mirror for collimation or even clean it without disassembling the whole optical tube.

    I lased the mirror through a ronchi screen and the optics look very good. The focal length is correct. At this point I suspect the teleextender is assembled incorrectly.

    If it were mine, I'd pull the optics out of the plastic fantastic tube and fit them to a better design. something like C and M have been selling us for the last 30 years. It's a shame that Synta/Celestron put all that capital into a fluffy design that actually makes the scope function poorly. They should have put it into to a better mount and quality control.

    George

  6. The Following User Says Thank You to Zalmond For This Useful Post:

    Michael Wilson (02-06-2012)

  7. #5
    FatherGuse's Avatar
    FatherGuse is offline HYPER GIANT
    Points: 14,603, Level: 83
    Level completed: 30%, Points required for next Level: 247
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points365 Days+ Registered Achievement!200+ Posts Achievement!
    Join Date
    Nov 2008
    Location
    Tarheel State, USA
    Posts
    2,027
    Points
    14,603
    Level
    83
    Thanks
    185
    Thanked 187x 147 Posts

    Default

    ... actually I have been recently wrestling with mine ... very frustrating ... now that I have a few more scopes and some more experience with gear, this particular scope is starting to become a "project" ... issues? ... rattling EPs in the focuser ... image shift with the focuser ... re-collimation (which is just becoming a CHORE!) ...

    ... I now use the mount under a EXT-70 OTA just to have a fun grab-and-go that does not use batteries/power ...

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Bill - "Recreational 'Stronomer" and "Astro-Junk User" ... EGO lego , proinde EGO operor ...

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  8. #6
    heatmizer's Avatar
    heatmizer is offline Junior Member
    Points: 7,283, Level: 59
    Level completed: 67%, Points required for next Level: 67
    Overall activity: 0%
    Achievements:
    10 Days registered365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!1000 Days+ Registered Achievement!
    Join Date
    Dec 2008
    Posts
    15
    Points
    7,283
    Level
    59
    Thanks
    1
    Thanked 7x 7 Posts

    Default

    Mine had the same problem the internal barlow was loose. Fix is remove the draw tube and tigten the barlow. also make sure its in the right way. While its out you can fix the focuser slop. Drill and tap 4 holes for in focuser. 2 on each side of focuser knob spaced 120 degrees apart. 6-32 is good. You either get plastic screws or metal. but with metal you need to glue strips of plastic into the focuser tube so the screws don't cut into the drawtube.

    Here is an example:
    Last edited by heatmizer; 02-26-2009 at 04:42 PM.

  9. The Following User Says Thank You to heatmizer For This Useful Post:

    FatherGuse (02-26-2009)

  10. #7
    star drop's Avatar
    star drop is offline Guilty as Charged
    Points: 14,490, Level: 82
    Level completed: 98%, Points required for next Level: 10
    Overall activity: 0%
    Achievements:
    10 Days registeredFirst 1000 Experience PointsGot three Friends20+ Friends Achievement!365 Days+ Registered Achievement!
    Join Date
    Nov 2008
    Location
    .
    Posts
    2,265
    Points
    14,490
    Level
    82
    Thanks
    11
    Thanked 475x 211 Posts

    Default

    Hi George,

    Welcome to Astronomy Forum.

  11. #8
    Zalmond's Avatar
    Zalmond is offline White Dwarf
    Points: 7,194, Level: 59
    Level completed: 22%, Points required for next Level: 156
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!2 Posts Achievement
    Join Date
    Feb 2009
    Location
    upstate
    Posts
    11
    Points
    7,194
    Level
    59
    Thanks
    1
    Thanked 2x 2 Posts

    Default Where did that eyepiece Go??

    Following Gus' advice I looked carefully at the barlow in the draw tube. Suddenly my brain stopped hallucinating a complicated upper barlow lens assembly and saw that someone had taken off the visual back and stuffed a 10mm Kellner in there. What I had been seeing as baffling was the rubber eyepiece cup. A couple of taps got the offender out and now we can focus. Hope the owner likes his new found eyepiece.
    George

  12. #9
    FatherGuse's Avatar
    FatherGuse is offline HYPER GIANT
    Points: 14,603, Level: 83
    Level completed: 30%, Points required for next Level: 247
    Overall activity: 0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points365 Days+ Registered Achievement!200+ Posts Achievement!
    Join Date
    Nov 2008
    Location
    Tarheel State, USA
    Posts
    2,027
    Points
    14,603
    Level
    83
    Thanks
    185
    Thanked 187x 147 Posts

    Default

    ... amazing ... just when you think you saw everything, along comes something completely unexpected ...

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Bill - "Recreational 'Stronomer" and "Astro-Junk User" ... EGO lego , proinde EGO operor ...

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  13. #10
    Muhammad's Avatar
    Muhammad is offline White Dwarf
    Points: 833, Level: 16
    Level completed: 33%, Points required for next Level: 67
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!
    Join Date
    Jun 2012
    Location
    Egypt
    Posts
    26
    Points
    833
    Level
    16
    Thanks
    0
    Thanked 0x 0 Posts

    Default Re: Problem with my new celestron astromaster 114 newtonian telescope.?

    I have the same problem with my reflector telescope ( its not celestron), its the first time to use a telescope,after time of attempts to catch objects in sky, I saw many stars but they were like what i see by my own eyes,when i used the focous power on saturn to get closer image, i saw the rings of front face of telescope on the planet body and the planet was incomplete and not clear, looked divided into two parts by ring shadow.

    Plus,when i use my 3x barlow lenses with eyepiece, I dont see anything, it looks dark and no objects or even sight pace to look through.

    Do i need collimation?? or what the problem exactly?

    I also have EQ3 german mount

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. Celestron Astromaster 130EQ Mount Problem
    By smokesha in forum Celestron Telescope Forums
    Replies: 12
    Last Post: 03-27-2016, 04:40 PM
  2. Celestron AstroMaster 114 EQ Reflector Telescope
    By rlmcclell in forum Reflector Telescope Forum
    Replies: 6
    Last Post: 01-05-2011, 10:08 AM
  3. Celestron AstroMaster 90EQ Telescope???
    By mufc4ever in forum Celestron Telescope Forums
    Replies: 0
    Last Post: 08-29-2010, 06:28 AM
  4. Problem viewing with newtonian noname telescope
    By earthling in forum Reflector Telescope Forum
    Replies: 4
    Last Post: 03-14-2009, 01:28 PM
  5. Skywatcher EXPLORER-130 Telescope or Celestron AstroMaster 130 EQ
    By arnookie in forum Reflector Telescope Forum
    Replies: 4
    Last Post: 09-09-2008, 10:25 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin« Version 4.2.0
Powered by vBulletin«
All times are GMT. The time now is 03:38 AM.