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Thread: EQ mount and counterweight

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    Default EQ mount and counterweight



    Hi Everyone, I have just purchased a Sirius EQ-G mount which comes with an 11 pound counterweight and would like to know
    how much of a counterweight would I need to balance my 80mm orion short tube telescope or my nexstar 6 SE. I am waiting
    for a larger scope to come in and was anxious to try it out using my little short tube, but it wouldn't balance. I suppose it will be necessary to purchase lighter counterweights for various scopes depending on the weight of the scope with various accessories attached. Thanks for your help.

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    Default Re: EQ mount and counterweight

    Any size of weight can balance a large range of scope weights, since you can place the weight anywhere on the arm. If the 11 lb weight is too much even slid all the way in (and I know it can be for light loads), then try a 5 lb weight. A 5 lb weight at the outer end of the arm will take over where the 11 lb weight at the inner end leaves off, probably with a bit of overlap.

    You can probably guesstimate how much of a change is required: you can feel if you need something half the weight or one-quarter the weight.

    For light loads like my 70mm x 230mm refractor or just the camera, I use a 2 lb dumbell weight clamped onto the bar. I have the same mount as you.

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    Default Re: EQ mount and counterweight

    The ST80 is too light for an 11lb weight. I know because I tried it on an EQ6. Counter weights sold by astro shops are pretty expensive considering what they actually are - a round piece of iron or steel with a hole in the middle. I now make my counter weights from barbell weights: dead cheap, buy locally (no shipping), can be had in various weights. Now the tricky part, they have 25mm holes in the middle. The weight bar on the scope is much smaller so my solution is to epoxy a wooden dowel in the hole and then drill it out to the correct diameter. I hold them in place with shop made wooden washers with a little short bolt threaded through a drilled hole. Simple, cheap, easy. You could even paint them white if you wanted to.

    5 lbs will counter balance the ST80.

    Barbell weights.JPG
    fogfire, Rayskipro and che like this.

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    Default Re: EQ mount and counterweight

    Thanks Keith, I was thinking that I must have done something wrong since I was apprehensive about using the mount for the first time. I'm familiar with the small orion eq mount with slow motion cables and small counterweight which I use with the small scope.
    Thanks

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    Default Re: EQ mount and counterweight

    Thank you Patrice, Guess I'll look into your solution. I've seen the barbell weights in several sporting goods shops and I think my husband
    has a few gathering dust in his studio. He probably won't even miss one or two.
    Thanks

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    Default Re: EQ mount and counterweight

    Another thing Ive done as a counter weight for an ST80 is a plastic jar filled with marbles. Drilled a hole in the lid and bottom of the jar just slightly smaller than the diameter of the shaft and friction alone is more than enough to hold it in place.

    The counter weight bar goes clear through the bottom of the jar.

    EQ-1 on survey tripod.JPG

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    Default Re: EQ mount and counterweight

    Quote Originally Posted by Patrice Lanteigne View Post
    Another thing Ive done as a counter weight for an ST80 is a plastic jar filled with marbles. Drilled a hole in the lid and bottom of the jar just slightly smaller than the diameter of the shaft and friction alone is more than enough to hold it in place.

    The counter weight bar goes clear through the bottom of the jar.

    EQ-1 on survey tripod.JPG
    Patrice, now that's an innovative and colourful solution. Thanks.
    Ray
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    William Optics ZenithStar 80 ED APO with FR

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    Default Re: EQ mount and counterweight

    I bought some 7.5 lb counter weights from Orion that work perfectly for my smaller 70, 80 mm and C6 scopes.

    Stan

    Orion Counterweights for Equatorial Mounts | Orion Telescopes

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    Vixen R130sf, Porta II mount
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    William Optics FLT 132 Triplet APO

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