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Thread: Skywatcher 80ED or 100ED on Celestron Advanced VX

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    Default Skywatcher 80ED or 100ED on Celestron Advanced VX



    I have been studying for a course in the last few months but I have now come back to my astro-imaging aspirations. I need this help from the experts here. I have decided to begin with a Celestron Advanced VX mount but I am vacillating between getting a Skywatcher 80ED and a Skywatcher 100ED. The 100ED is currently on sale and almost the same price as the 80ED but I will like to know if there are any issues that will make the 100ED unsuitable for the Celestron Advanced VX mount. I know aperture is not all that important in astrophotography but both scopes are almost the same price presently but with only a difference of $10. I don't know why sky watcher put up the 100ED but not the 80ED on sale, practically making them the same price.
    Last edited by Kel123; 12-18-2017 at 08:06 AM.

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    Default Re: Skywatcher 80ED or 100ED on Celestron Advanced VX

    Also, I noticed that the 80ED is heavier than the 100ED. Why should it be that way?

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    Default Re: Skywatcher 80ED or 100ED on Celestron Advanced VX

    The biggest thing to take in mind is that the 80 has a faster f ratio so I would go with that one. A longer scope on the AVX mount might have a chance to bump into the leg of the tripod. As far as heavier the 100 looks heavier on the website I am on. Sometimes they mix up the data.
    Either scope will serve you well and if you decide on the 100 you can always get the skywatcher focal reducer, these scope only work with their matched focal reducer so stick with that.

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    Default Re: Skywatcher 80ED or 100ED on Celestron Advanced VX

    Thanks Christo for your thoughts. I will surely consider your advise.

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    Default Re: Skywatcher 80ED or 100ED on Celestron Advanced VX

    Quote Originally Posted by Kel123 View Post
    I have been studying for a course in the last few months but I have now come back to my astro-imaging aspirations. I need this help from the experts here. I have decided to begin with a Celestron Advanced VX mount but I am vacillating between getting a Skywatcher 80ED and a Skywatcher 100ED. The 100ED is currently on sale and almost the same price as the 80ED but I will like to know if there are any issues that will make the 100ED unsuitable for the Celestron Advanced VX mount. I know aperture is not all that important in astrophotography but both scopes are almost the same price presently but with only a difference of $10. I don't know why sky watcher put up the 100ED but not the 80ED on sale, practically making them the same price.
    I have both of them, primarily used for solar imaging with a Quark.

    I also have an AVX that I use with an AR152 mostly for visual at public outreach events, but haven't had either scope on it. With the usual exception of a common, possible tube strike with the 100mm, there should be no issues with that mount at all.

    Both scopes have the same focuser. If you need to adjust the focuser, send me a PM with your email address as I have a nice PDF that describes (with pics) the internal adjustments in detail.

    My 80mm focuser was smooth and well adjusted right outta the box. However, the 100mm had a very rough spot that caused some problems at fine focus. I sent the entire scope back for an exchange... no problems. However, the second 100mm focuser needed adjustments and I didn't feel like fooling around with it, so I installed a GSO Linear Bearing focuser. Here's a pic of the 100ED with the focuser taking a solar shot...



    Why the prices bouncing around? They do that all the time. All SW Pros are drop-shipped in the US via the Celestron warehouse in southern California. Celestron acts as the logistics manager for SW in the states. Thus SW, through all the dealers, bounces the prices to keep a balanced inventory in Celestron's warehouse. The only place that's not true is if you purchase thru Amazon.

    Quote Originally Posted by Kel123 View Post
    Also, I noticed that the 80ED is heavier than the 100ED. Why should it be that way?
    I wondered the same thing when studying the scopes. Here's why...

    Both tubes are the same size, except the 80 is obviously shorter. The 80mm's objective cell is simply installed in the tube, resulting in a significantly heaver cell on the front end. Everything else is identical, including the dew shield.

    Hope that helps...

    Clear, Dark Skies
    Last edited by Lowjiber; 12-18-2017 at 12:12 PM.
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    Default Re: Skywatcher 80ED or 100ED on Celestron Advanced VX

    Quote Originally Posted by Lowjiber View Post
    I wondered the same thing when studying the scopes. Here's why...

    Both tubes are the same size, except the 80 is obviously shorter. The 80mm's objective cell is simply installed in the tube, resulting in a significantly heaver cell on the front end. Everything else is identical, including the dew shield.

    Hope that helps...

    Clear, Dark Skies
    Are we looking at the same scopes? I do not see the 80 as heavier on the Skywatcher supplied manual.
    Screen Shot 2017-12-18 at 7.56.54 AM.png
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    Default Re: Skywatcher 80ED or 100ED on Celestron Advanced VX

    I agree that the SW manual shows the 100ED as heavier. However, like many things in supplied manuals that's not correct. If you go to OPT's website for example, you'll see that the 80ED OTA weighs more. Using both scopes on the same mount, I have to slide the RA counter-weights down a bit more to balance the 80mm.
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    Default Re: Skywatcher 80ED or 100ED on Celestron Advanced VX

    Quote Originally Posted by Lowjiber View Post
    I agree that the SW manual shows the 100ED as heavier. However, like many things in supplied manuals that's not correct. If you go to OPT's website for example, you'll see that the 80ED OTA weighs more. Using both scopes on the same mount, I have to slide the RA counter-weights down a bit more to balance the 80mm.
    And go to Astronomics website they have totally different weights. Now I am curious how a longer larger aperture scope weight is less than a shorter a shorter smaller aperture scope? I get that you have both and I assume when you have the 80 on your mount it has the same equipment as the 100 would have on it when you tug the weight out. I love a good mystery.

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    Default Re: Skywatcher 80ED or 100ED on Celestron Advanced VX

    I'm not losing any sleep over it. Yes, I have the same equipment on board both scopes when imaging... see pic above.

    When I installed the GSO focuser pictured above, it made sense to me. They just cut the thin metal in the tube about 12" shorter and stuck the heavier (spell that "thicker") objective cell in the front. It appears, although I didn't go further, that the difference between the "removed" tin's weight and the larger 80mm objective cell made the difference.

    It wouldn't do me any good to actually weigh them for you, as the GSO Linear Bearing focuser on the 100mm is much heavier than the cast aluminum one that I removed.

    They both work just fine.

    Clear Skies
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    Default Re: Skywatcher 80ED or 100ED on Celestron Advanced VX

    Quote Originally Posted by Lowjiber View Post
    I'm not losing any sleep over it. Yes, I have the same equipment on board both scopes when imaging... see pic above.

    When I installed the GSO focuser pictured above, it made sense to me. They just cut the thin metal in the tube about 12" shorter and stuck the heavier (spell that "thicker") objective cell in the front. It appears, although I didn't go further, that the difference between the "removed" tin's weight and the larger 80mm objective cell made the difference.

    It wouldn't do me any good to actually weigh them for you, as the GSO Linear Bearing focuser on the 100mm is much heavier than the cast aluminum one that I removed.

    They both work just fine.

    Clear Skies
    I am still confused how the 80mm objective is heavier than a 100mm? when the glass is the same. If the 80 was the 80mm Esprit and the other was the 100 ED Pro I might believe it but as you have said 12" less tube and about 50% less glass I don't get the physics of the 80 being heavier if they are the same make and model.
    I'm sorry I just finished a class and this question is stuck in my mind with the extra free time.
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