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Thread: Clothespin and Maksutov on shaky mount.

  1. #1
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    Default Clothespin and Maksutov on shaky mount.



    Some years ago I was amazed by an amateur who came by and showed me the clothespin focusser. It should work like a dual speed focuser. I searched in the archives and found this thread:
    Poor man's dual speed focuser

    This must have been around the same time as I saw it the first time. May be even this amateur had read it over here!

    Nevertheless, it is an old solution for two major problems on Maksutovs on shaky mounts:
    Smooth fine focussing with a Maksutov on a shaky mount seemed virtually impossible. The simple clothespin is a very good solution.
    It works two ways:
    1. Fine focussing becomes very smooth and precise. I have tested that and came to the conclusion that in focus without the little pin was not the exact focus. With it it could be done much easier and smoothly.
    2. Shaky mount means no way to judge if you are in exact focus. By using just your fingertip pushing the clothespin, most tremors stay away.

    It really works!
    And yes...it is a ridiculous sight. But since I am mostly alone out there in the dark, nobody will notice.

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  3. #2
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    Default Re: Clothespin and Maksutov on shaky mount.

    Nice trick John!
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    Default Re: Clothespin and Maksutov on shaky mount.

    Hi John. I have since re-inherited my old SkyWatcher C90 Mak, when my son moved to Michigan in 2017 and left it here. I want to use this telescope for nature photography now. But your tip should also work on my Orion 180 Mak for lunar/planetary work, where fat fingers have a problem fumbling with the large primary mirror positioning knob. Thanks for this fine tuning tip John, and the best of regards.
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    Default Re: Clothespin and Maksutov on shaky mount.

    Hi John,

    I think this is a much more elegant solution than some of the guidance we have previously given which was to cut out the center of an old round plastic lid and slide it onto the focuser knob. Giving you a much bigger knob to turn thereby giving you finer control over your focus.



    I like your solution better.

    Cheers,
    JT
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    Default Re: Clothespin and Maksutov on shaky mount.

    Sometimes the simplest solution is the best! Do they still make clothes pins? Lol! Bill
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    Default Re: Clothespin and Maksutov on shaky mount.

    Quote Originally Posted by burris View Post
    Sometimes the simplest solution is the best! Do they still make clothes pins? Lol! Bill
    Hi Bill,
    They actually still make wooden clothes pins. Problem is they don't open wide enough to accommodate most (if not all) focusing knobs. So something like this from Harbor Freight would definitely work. Remember it is not just Harbor Freight Tool Supply it is actually Harbor Freight Tool and Telescope
    Accessory Supply! In case you are interested that is Item#39569 on the HF website. It is the 1" Steel Spring Mini-Clamp.



    Cheers,
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    Default Re: Clothespin and Maksutov on shaky mount.

    Quote Originally Posted by jaetea View Post
    Hi Bill,
    They actually still make wooden clothes pins. Problem is they don't open wide enough to accommodate most (if not all) focusing knobs. So something like this from Harbor Freight would definitely work. Remember it is not just Harbor Freight Tool Supply it is actually Harbor Freight Tool and Telescope
    Accessory Supply! In case you are interested that is Item#39569 on the HF website. It is the 1" Steel Spring Mini-Clamp.



    Cheers,
    JT
    Thanks JT!
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    Default Re: Clothespin and Maksutov on shaky mount.

    Hi all. Here is one more. I just checked with the wife, an JT is right about only the wooden clothes pins that don't open wide enough are still available. BUT, she also told me that you can always get the plastic potato chips/popcorn/or other snack bag clip sealers. They are cheap, light weight, and open far enough to accommodate the large Mak focusing knob.
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    Default Re: Clothespin and Maksutov on shaky mount.

    BTW, the HF clip is only $0.99, so even my CFO would approve it.

    Cheers,
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    Default Re: Clothespin and Maksutov on shaky mount.

    Quote Originally Posted by Makuser View Post
    Hi all. Here is one more. I just checked with the wife, an JT is right about only the wooden clothes pins that don't open wide enough are still available. BUT, she also told me that you can always get the plastic potato chips/popcorn/or other snack bag clip sealers. They are cheap, light weight, and open far enough to accommodate the large Mak focusing knob.
    You are right Marshall! Just stole one from the kitchen! it fits my C-8 and my ETX-125 knobs! Thanks! Bill
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