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Thread: Building an EQ Wedge for the Celestron SLT/GT Goto Mount To Capture Nightscape Images

  1. #11
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    Default Re: Building an EQ Wedge for the Celestron SLT/GT Goto Mount To Capture Nightscape Im



    I've done some experimenting using a simple homemade wedge on my NexStar SLT mount. Unfortunately ... at least with my mount ... any OTA that weighs around 3-4 pounds and over will cause the polar axis clutch to slip since the weight of the scope is greatly offset from the polar axis. This clutch can be easily tightened to hold greater weight, however it's not going to relieve the strain on the polar motor or gears and it will only add to the strain. A second possible solution is to add a counterweight opposite to the OTA, but that's only going to add additional weight to the system which will again limit the weight of an OTA.

    So ... from my experience ... if you want to build a wedge for your NexStar GT/SLT mount with the intent to use it with an OTA that weighs more tha 3-4 pounds, you'll likely run into some problems. However, if you want to build a equatorial imaging platform for a DSLR camera and lens, then this should be a very doable project ... as eloquently demonstrated by the successful wedge build and posted images by "jaetea".

    NexStar_GT_Wedge.jpg
    mstar74 likes this.

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    jaetea (02-17-2017)

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    Default Re: Building an EQ Wedge for the Celestron SLT/GT Goto Mount To Capture Nightscape Im

    Excellent article, JT! Thanks very much.

    smp
    Stephen
    Celestron NexStar 5i
    Coronado PST

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    jaetea (02-17-2017)

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    Default Re: Building an EQ Wedge for the Celestron SLT/GT Goto Mount To Capture Nightscape Im

    Quote Originally Posted by jaetea View Post
    I am constantly vacillating between the two follow-on realignment procedure after the ASPA. Sometimes I do just replace the original alignment stars (with themselves) to regain the goto accuracy. At other times I do the full on power down, then power up with another 2-star align from scratch. The interesting thing is that when I do the replace the original alignment stars (with themselves) realign procedure (then look at the error from the NCP). Then immediately do a power off/on align from scratch, I get different NCP error numbers after this align. The mount was not moved between the two alignments. The only thing done was a power off/on cycle. This is true for ALL my Celestron Alt-Az mounts. Hmmm....


    JT
    JT,

    I also experience the same thing with my 4SE mount and wonder which one has the least error.

    Joe
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