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Thread: Finder Scope Options for Celestron Astromaster 130

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    Default Finder Scope Options for Celestron Astromaster 130



    I am brand new to this and I bought a used Celestron 130 which I am very happy with excepting the spotting scope which borders on useless. I am a "tinkerer' with a workshop and an "add-on" star-spotting scope would seriously upgrade this scope so I could do some star hopping - I have a couple of questions:

    1. Are there pros or cons to finder scope options which someone with experience would suggest? I've been considering something like the Orion 9x50 Achromatic Telescope Finder Scopes (first post so no links allowed)

    2. Is there an obviously preferred area to place the new finder scope (or to avoid?)

    I understand that the introduction of a few screws into the tube (to secure the new finder scoper) will basically not alter the image.

    I appreciate any advice that you can provide.

  2. #2
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    Default

    hi and welcome to the forums.
    why not look at a rigel quick finder or a telrad?
    just my opinion fwiw.
    clear skies,

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    andy

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    Default

    Welcome to the forums,
    most people prefer telrad or Orion EZFinder spotting scopes
    and if you love to tinker, add a green laser as well!
    My Dob has the EZFinder II and my other scope has Meades red dot version. Both work great.
    Good luck
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    Default

    I'll check those out (and start looking for green lasers...sounds cool not sure "why" yet...:-)

    Cheers and thanks!

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    Default Re: Finder Scope Options for Celestron Astromaster 130

    I'm looking for a RACI Finder scope for my AstroMaster 130EQ. I do not like to have to get up out of my chair while observing and have to constantly change positions when I want to find a new object to observe. I don't know who ever thought line of site finder scopes were a good idea! Hehe. Here's a list of what I plan to add to the scope.

    Orion Dual Finder Scope Mounting Bracket
    Orion Black 9x50 Right-Angle Correct-Image Finder
    Orion SkyLine Deluxe Green Laser Pointer & Telescope Bracket

    And yeah I know I don't nescesscarily need both the laser, and the finder scope, but I like to tinker too, and since the laser is just a general pointing device like some stated, the 9x50 scope helps to narrow it down even more. All this without having to swap stuff in and out constantly. Then I can just have my 10mm Baader-Planetarium Hyperion and Televue 2x barlow already in the focuser and done. Just slew and view!

    Clear Skies.

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    Default Re: Finder Scope Options for Celestron Astromaster 130

    A Telrad or Rigel finder are easily installed without the need to drill holes and, more important, work and work outstandingly well. To make things even better, neither will break the bank.
    SXINIAS

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    Default Re: Finder Scope Options for Celestron Astromaster 130

    Quote Originally Posted by sxinias View Post
    To make things even better, neither will break the bank.
    That depends on how big your bank is.

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    Default Re: Finder Scope Options for Celestron Astromaster 130

    Hi gazer,
    this is a familiar issue with the 130EQ.On mine,after struggling for long enough with the attached Celestron RDF I bought the Rigel Quickfinder and the difference is quite amazing - easy to attach and set up and importantly very easy to use - and it works brilliantly. The temptation (as I did) is to remove the old RDF and replace it as near as possible with the Rigel. Wrong! Because of the way the Rigel works you can put it almost anywhere on the OTA that you find most convenient, ie that doesn't crick your neck too much. It even works well at the bottom end of the tube! So if you get one - think about positioning a bit because the sticky attachment pads are very very sticky.
    Ever the glutton for punishment I bought a 9x50 optical finder which I think will be similar to the Orion:
    Skywatcher 9x50 Right-Angled, Erecting Finderscope - First Light Optics
    regarding "I understand that the introduction of a few screws into the tube (to secure the new finder scoper) will basically not alter the image." care is needed
    It requires the OTA to be drilled for the mount to be attached. This requires the primary mirror to be removed - to avoid swarf making a mess of it and obviously it needs the OTA to be upright to avoid a similar issue with the secondary. Afterwards - the scope collimation needs checking and adjusting. The whole thing is a pretty easy job - but worth thinking through if you are not too sure about it.
    I find the right angled corrected view finder is good to use, is optically quite good, and gives a useful 5 degrees fov which is good for star hopping.
    Hope this helps.
    Ian

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    Default Re: Finder Scope Options for Celestron Astromaster 130

    If you buy a Rigel or a Telrad, just use double-backed tape to mount them. Clean the OTA with alcohol beforehand, and you'll not have a problem. BTW: if you ever need to remove anything mounted with double-backed tape, use dental floss to "cut through it" and finish removing residue glue with Goof Off.

    I've drilled several reflector OTA's. A 130mm is fairly small, but here's some general advice...

    • Take your time. Figure out where the drill will not interfere with the spider, and base your mount decision on that.
    • Any time you drill (or do any work) near the secondary, make sure you position the mount so the primary mirror is at least slightly above your work.
    • You can often work with the secondary mirror in place. Just gently install a couple of tissues between it and your "drill site". This will catch just about anything that might otherwise land on the mirror.
    • Drill slowly! The tube isn't all that thick. Slow and easy drill motor speed and gentle "pressure" is all that's needed. You want to avoid plunging through with the bit and striking the mirror and/or spider.
    • Don't use any oil on the bit. I don't care what your shop teacher told you, the drill bit is not going to get hot enough to require oil.
    • After the holes are completed, use a vacuum before removing any tissue or other "masks" you may have used.


    When installing the screws/nuts, I prefer self-locking nuts. They eliminate the need for washers and/or lock-washers, making installation much simpler... especially on a smaller OTA. There is no real need to over tighten the screws (again, on a small OTA). This is a telescope, not a lug nut on a car.

    Clear Skies
    Last edited by Lowjiber; 12-02-2013 at 02:29 PM. Reason: spell
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    John (Urban Astronomer)
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