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Thread: Nexstar 127 SLT OTA to mount balance point measurement?

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    Default Nexstar 127 SLT OTA to mount balance point measurement?



    Hello again, geezer rookie -lol- with another rookie question.

    This is my first "good" telescope and I want the GoTo mount and battery pack to last as long as possible, which to me means having the OTA properly balanced in the dovetail.

    With that in mind, I want to mark the tube and the mount with an alignment line so that each time the tube is removed for travel, it can quickly go back right where it should be.

    If anyone has this model and has it in balance on the mount, how many inches/mm is it from the back of the mount dovetail to the back of the OTA rail? (How far does the telescope stick out) With that measurement I can assemble the unit and make a permanent guide line.

    Thanks in advance for any assistance.

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    Default Re: Nexstar 127 SLT OTA to mount balance point measurement?

    You can find the balance point of the telescope by placing it on a tabletop with a pencil under the dovetail and move the telescope back and forth until you find the balance point.
    Use the knob on the mount that tightens the dovetail clamp as the center mark on the mount.

    Though the instruction and Celestron pictures show that knob pointing down, turn it so it is pointing up. (using the hand controller)
    It will be easier to tighten and it also puts the solid half of the dovetail clamp on the bottom for better stability of the telescope.

    Batteries used in the built in battery pack will be used quickly and rechargeables do not provide enough power for the mount.
    A jump pack such as this will last for years if properly maintained.
    https://www.harborfreight.com/3-in-1...ter-62306.html
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    Default Re: Nexstar 127 SLT OTA to mount balance point measurement?


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    Default Re: Nexstar 127 SLT OTA to mount balance point measurement?

    Turn the mount knob up though (black knob top of mount), it is more stable for viewing.

    https://www.dropbox.com/s/kk32jyxh3g..._2592.jpg?dl=0
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    Ya gotta keep this Apo/
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    Default Re: Nexstar 127 SLT OTA to mount balance point measurement?

    Done and done - Great advice - thanks

    https://photos.app.goo.gl/4mGxKuPrrGzaNwqz5

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    Default Re: Nexstar 127 SLT OTA to mount balance point measurement?

    A much clearer pic of the Nexstar+ mount with the securing knob now oriented up -

    https://photos.app.goo.gl/pwGcHrDiHvwWj4Ar6

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    Default Re: Nexstar 127 SLT OTA to mount balance point measurement?

    The gold pinstripping is pretty
    It looks good, I hope you have a lot of fun with the telescope and mount.
    If you have not done so yet, do not forget to adjust your backlash settings to help increase goto accuracy and steady tracking.
    Easily done in the daytime in about 10-15 minutes.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    The weakest link in the optical chain is the large nut located directly behind the
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    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: Nexstar 127 SLT OTA to mount balance point measurement?

    Gold marking courtesy of a felt tip Krylon paint pen I found on Amazon. Works great, I've used it to highlight metal address numbers on my front door and even the cast plastic eagle on cheapie outdoor flagpoles.
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    Default Re: Nexstar 127 SLT OTA to mount balance point measurement?

    The balance point will shift depending on diagonal, finder, EP and other accessories you putting on the scope, but it is easy to find as Gabby suggested.

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    Default Re: Nexstar 127 SLT OTA to mount balance point measurement?

    For a reference I only have the OEM diagonal and finder, and balanced using my heaviest EP, a 32mm Plossl. For the lower number EPs I'll know to shift the OTA a bit more to the rear to compensate. I realize this 'exact' balance point is not super-critical, but I'd rather err on the side of caution.

 

 
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