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Thread: Orion CT80 and 80ST and the Meade Infinity 80mm

  1. #1
    SalehRam's Avatar
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    Question Orion CT80 and 80ST and the Meade Infinity 80mm



    Hello all,

    I've been considering for a while a second telescope along with my current one and I'm looking at 3 models:
    Orion CT80 (EQ mount)
    Orion 80ST (EQ mount)
    and Meade Infinity 80mm (AZ)

    I'm looking to get wider views for DSO's and to give the chance for my family to get to use a smaller, lighter and more simpler telescope.

    First I'm confused between the 2 Orion models above. I've read a while ago that there are 2 80mm models from Orion, one is good, the other is scrap.

    And I saw the Meade Infinity 80mm and from what I was able to gather about it it is a good quality?

    Currently the mount has no issues for me (I'll put the OTA on my CG4 mount when looking to watch DSO, and will be on its AZ mount when family want to observe with me).

    So questions:
    1. Which one of those 2 Orion models are good, and bad.
    2. Is the Meade above a better quality and a good deal for what I want to do?

    I'm favouring the Meade Infinity 80mm, although it is AZ, if the 2 Orions above are bad I'll go for it.

    Thanks!
    Telescope(s): Celestron Omni XLT 102mm (4") f/9.8 refractor w/ upgraded GSO focuser and RACI finder + QHY MiniGuideScope
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    Default Re: Orion CT80 and 80ST and the Meade Infinity 80mm

    If you want a relatively inexpensive wide field 80mm refractor I'd probably go for a Sky-Watcher ST80. These are Synta made, like the old Orion ST80's.

    https://www.rothervalleyoptics.co.uk...telescope.html



    I've modified mine with a GSO Crayford focuser. The mount in the picture above is a Sky-Watcher AZ5 Deluxe. Although my ST80 came with an EQ1 mount. The EQ1 is OK but it is a bit light.



    The picture above is the ST80 (before focuser modification) on an EQ2 mount with the EQ1 counterweight. If you want my advice avoid the AZ3 mount and the ST80 version supplied with the AZ3. The AZ3 mount suffers from severe altitude drift and its lock washer isn't up to the job. The AZ3 won't work for astronomy and is about as useful as a chocolate teapot.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: Orion CT80 and 80ST and the Meade Infinity 80mm

    Quote Originally Posted by Shorty Barlow View Post
    If you want a relatively inexpensive wide field 80mm refractor I'd probably go for a Sky-Watcher ST80. These are Synta made, like the old Orion ST80's.

    https://www.rothervalleyoptics.co.uk...telescope.html



    I've modified mine with a GSO Crayford focuser. The mount in the picture above is a Sky-Watcher AZ5 Deluxe. Although my ST80 came with an EQ1 mount. The EQ1 is OK but it is a bit light.



    The picture above is the ST80 (before focuser modification) on an EQ2 mount with the EQ1 counterweight. If you want my advice avoid the AZ3 mount and the ST80 version supplied with the AZ3. The AZ3 mount suffers from severe altitude drift and its lock washer isn't up to the job. The AZ3 won't work for astronomy and is about as useful as a chocolate teapot.
    It seems I have issues with seeing the images here...

    I found 2 variants for the Sky-watcher telescope, one is Cyan/blue colored, the other one is black... I only assume it is a color difference right?

    Also it does not seem to be in stock with many suppliers...

    So comparing the Sky-watcher to the Infinity, which one is good (considering the range those 2 telescope are)..
    j.gardavsky likes this.
    Telescope(s): Celestron Omni XLT 102mm (4") f/9.8 refractor w/ upgraded GSO focuser and RACI finder + QHY MiniGuideScope
    Mount: Computerized CG-4 | Eyepieces: 25mm, 14mm, 10mm, Omni 2x barlow, GSO 3x barlow
    Cameras: My Google Pixel XL camera, ZWO ASI224MC-S, QHY5L II-Mono | Binoculars: Oberwerk 11x56
    Taking photos from the house's window!

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    Default Re: Orion CT80 and 80ST and the Meade Infinity 80mm

    The SkyWatcher and the Meade are the same basic scope, both good. The Orion scopes have a different focuser (plastic) and I would stay away from those.

    The focusers on the SkyWatcher and the Meade can VERY EASILY be improved by cleaning out the stock grease (GOO!), taking out any play by shimming with Teflon tape, and re-greasing with white lithium. This usually makes a LARGE improvement to the focuser, but you can also easily replace the focuser with an affordable 2 speed crayford 2" GSO focuser.

    These are GREAT little scopes (I have two of them) that will see a LOT of use.
    j.gardavsky and Gabby76 like this.

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    Default Re: Orion CT80 and 80ST and the Meade Infinity 80mm

    Quote Originally Posted by SalehRam View Post
    It seems I have issues with seeing the images here...

    I found 2 variants for the Sky-watcher telescope, one is Cyan/blue colored, the other one is black... I only assume it is a color difference right?

    Also it does not seem to be in stock with many suppliers...

    So comparing the Sky-watcher to the Infinity, which one is good (considering the range those 2 telescope are)..
    The blue OTA colour was the old Synta/Sky-Watcher one. They now usually have the 'black diamond' finish (which is sort of black).

    EQ 2 small weight (1).jpg

    You might be able to see these thumbnail images.

    venusdenied fx1.jpg

    https://www.omegon.eu/telescopes/ome...00-ota/p,47423

    Above is the link for the Omegon ST80.

    https://telescopereviewer.com/meade-...escope-review/

    Here is a link about the 80mm Infinity. It looks OK, although I've heard reports about dodgy quality control. I'm not totally convinced these are rebadged Synta either. It will probably be OK, the 102mm Infinity is quite popular.
    Attached Images Attached Images
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    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: Orion CT80 and 80ST and the Meade Infinity 80mm

    Also, the 80mm Infinity seems to have a decent mount/tripod.

    AZ3 nut2.jpgAZ3 bollocksup (4).jpg

    The AZ3 above had serious problems with altitude drift and was virtually unusable.

    little frac (1).jpg

    The EQ2 worked but I prefer an alt-az for small grab and go scopes.
    j.gardavsky likes this.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: Orion CT80 and 80ST and the Meade Infinity 80mm

    If you are planning to put it on the CG-4, the Meade Adventure 80 is the most affordable. It is the same scope as the old Orion ST80 and the Meade Infinity 80 with a metal focuser. It comes with a decent bag, a lightweight useless tripod and some EPs and diagonal.
    Selling for $90 on Amazon.
    https://www.amazon.com/Meade-Instrum.../dp/B06XR5L9TK

    The dovetail on all of these are too short for balance in dec with heavier EPs or cameras, so be prepared to add a longer dovetail with rings.
    Last edited by AsteroidsRock; 11-20-2018 at 05:01 PM.
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    Default Re: Orion CT80 and 80ST and the Meade Infinity 80mm

    You can find used ST80s in the classifieds on Cloudy Nights.

    I just bought a Meade Adventurescope which appears to be identical to the ST80, except for the logo on the tube and focus knobs. First light tonight!

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    Default Re: Orion CT80 and 80ST and the Meade Infinity 80mm

    Update: I was pretty happy with the performance of my new Adventurescope / ST80 last night. Nice views around Orion and CMa. Too cold to stay out for a long time though.

    Toss the tripod and eyepieces, keep the backpack.
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    : Orion ST120 refractor, vintage Celestron C-8
    Mounts: ES Twilight 1, Celestron EQ fork with pod and wedge

 

 

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