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Thread: Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?

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    Question Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?



    I have a 6 inch Celestron SCT on a Twilight 1 mount and I'm pretty happy with it (well, after I adjusted the mount carefully and tightened it up a bit.) But now I'm thinking of upgrading to an 8" SCT, since OTAs (from the 8se line) seem very attractively priced right now. My objective is visual use (not photography), while maintaining ease of portability. In my present arrangement, I simply carry the whole setup at once (not separating the OTA from the mount) out of the house and put it down in my yard to look at the sky. I figure I can carry the additional weight of an 8" SCT vs a 6", since it is just a couple of pounds more, according to the published literature. But I'm a bit concerned about whether a Twilight 1 mount will still work well enough and be stable enough. How good/bad of an idea is this combination?

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    Default Re: Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?

    I do not have the Twilight mount, but I believe there are several members here that do use that mount with an 8" SCT.

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    Default Re: Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?

    The Twilight 1 is not made for the weight of that scope but can support it. I have both and tried it. The OTA pulls the mount out and down because of the weight imbalance. Also, I try to avoid longer focal length with the TW1 because vibration show up really well. There are links out there on how to fortify that mount for a cheap price but it might be worth just buying a different mount.
    Don't forget the additional weight of the 8" OTA vs others does not include the eyepiece and diagonal.

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    Default Re: Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?

    Twilight II is what I would use for a C8.
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    Default Re: Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?

    Quote Originally Posted by Christo View Post
    The Twilight 1 is not made for the weight of that scope but can support it. I have both and tried it. The OTA pulls the mount out and down because of the weight imbalance. Also, I try to avoid longer focal length with the TW1 because vibration show up really well. There are links out there on how to fortify that mount for a cheap price but it might be worth just buying a different mount.
    Don't forget the additional weight of the 8" OTA vs others does not include the eyepiece and diagonal.
    Thanks! I don't want the arrangement to be too likely to fall over. But one thing I especially like about the Twilight 1 mount is that it is relatively inexpensive. Based on what I have seen so far at various vendor sites, it seems that any mount rated for even just a little more weight costs 2-3x as much (or more)! Do you happen to know of a manual mount that supports a little more weight/bulk than a Twilight 1, but which is otherwise roughly similar, and also reasonably priced?

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    Default Re: Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?

    It wasn't that bad but I really think it isn't the weight as much as the vibration. The mount shouldn't fall over but the stress on the dovetail area to the mount is noticeable.
    Check this DYI out:
    https://www.cloudynights.com/topic/5...n-compilation/

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    Default Re: Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?

    The TW1 mount can hold about 12 pounds maximum if it is a short scope 24 inches long. Longer scopes would have to be lighter weight.
    Newtman but some refractors allowed.

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    Default Re: Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?

    C8 OTA weighs right around 12 pounds naked.

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    Default Re: Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?

    I have been using 8" SCT on Twilight 1 for years. You may look at my photo albums for a few pics of that setup.

    I found that if you place T1 arm straight up (at 90 deg) it handles 8" SCT much better than at 45 deg position, and if you don't use focal reducer there is enough clearance for the OTA to point at zenith without hitting the base. I also warped a couple of bungee cords around T1 arm to make it even more stable, but it should be fine even without.

    I really like this setup! For the 8" aperture it is amazingly compact, light weight and grab and go. When I observe from my patio I drag it around all the time to get a better angle.

    And I routinely push powers to 300x to split tight doubles and even on planets on occasion. There is a bit of shaking, but it dies out fast, so I can manually track at 300x and focus, no problem.

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    Default Re: Would you put a Celestron 8-inch SCT on a Twilight 1 Mount?

    Quote Originally Posted by Bigzmey View Post
    I have been using 8" SCT on Twilight 1 for years.
    I was wondering when you would get around to this thread.
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