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Thread: 180mm Mak questions - Sky Watcher vs Orion

  1. #1
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    Default 180mm Mak questions - Sky Watcher vs Orion



    I'm developing an itch for a 180 Mak. I like that long f/15 focal ratio vs f/10 for SCTs. I may not scratch that itch for quite a while yet, but some questions come up while I research, plan & dream.

    I've read that the S-W & Orion are supposed to be the same OTA, but, other than aperture & f/r, the listed specs are different.

    How can you get a 180mm f/15 scope in a 19.7" OTA (S-W) but need 22.5" for the Orion version? Does this have to do with the smaller limited 1.25" eyepiece capacity of the Orion?

    The longer Orion Mak weighs less than the shorter S-W Mak. Huh?

    The S-W Mak has a 2" rear cell adapter vs 1.25" on the Orion. I like the versatility of the 2". Is it the same adapter as found on SCT's, or is it something proprietary and limiting one to using specific Sky-Watcher Mak accessories?

    This video shows a modification to the S-W Mak where the user added a Crayford-style SCT focuser to the rear cell adapter using a special adapter ring.


    Has anyone mounted a Crayford focuser to a 180mm Mak? Advantages are supposedly finer focus control. Disadvantages?

    The UK link to the adapter ring used in the video is dead. Does anyone know of a US dealer making or selling the necessary adapter ring?

    The f/15 focal ratio suggests to me that I really do not need to invest in anything better than good Plossls for higher magnifications. True?

    Any recommendations for the best bang for the buck in a GEM style mount for it?

    Thnx
    Orion XX12g f/4.9 12" GoTo Dobsonian
    Orion 20x80 Binoculars
    Beaten & battered ancient Tasco 4-1/2" f/8 Newt on a GEM
    Not quite as ancient Bushnell 60mm x 800mm Reflector on a GEM


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  2. #2
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    Default Re: 180mm Mak questions - Sky Watcher vs Orion

    A chat with High Point Scientific answered a couple of my questions about the Sky-Watcher Mak. The new models have a full 2" pass-thru in the rear cell and the rear cell adapter is now a standard 66mm SCT thread, so any adapters that will fit a SCT will fit the SW 180mm. It also means that no adapter is needed to mount a Crayford focuser to the 180 - just screw it on directly to the rear cell. I still would like to know if anyone has tried using a Crayford on a Mak or SCT and how they liked it.
    Orion XX12g f/4.9 12" GoTo Dobsonian
    Orion 20x80 Binoculars
    Beaten & battered ancient Tasco 4-1/2" f/8 Newt on a GEM
    Not quite as ancient Bushnell 60mm x 800mm Reflector on a GEM


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    Default Re: 180mm Mak questions - Sky Watcher vs Orion

    I've sent an inquiry to Skywatcher asking if the hole in the primary has been enlarged, or if they only changed the size of the rear cell adapter ring to 66mm.
    Orion XX12g f/4.9 12" GoTo Dobsonian
    Orion 20x80 Binoculars
    Beaten & battered ancient Tasco 4-1/2" f/8 Newt on a GEM
    Not quite as ancient Bushnell 60mm x 800mm Reflector on a GEM


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    Default Re: 180mm Mak questions - Sky Watcher vs Orion

    Update: No reply yet from Sky-Watcher about the size of the hole in the primary mirror, but I found a discussion on another forum that suggests only the threaded ring size was changed - the primary hole remains the same.

    I'm still hoping some of the 180 Mak owners on this forum will reply to some of my questions.
    Orion XX12g f/4.9 12" GoTo Dobsonian
    Orion 20x80 Binoculars
    Beaten & battered ancient Tasco 4-1/2" f/8 Newt on a GEM
    Not quite as ancient Bushnell 60mm x 800mm Reflector on a GEM


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    Default Re: 180mm Mak questions - Sky Watcher vs Orion

    Is it the same adapter as found on SCT's, or is it something proprietary and limiting one to using specific Sky-Watcher Mak accessories?
    Yes, It´s SCT compatible, I own one and use to exchange the SCT diagonal among the 180 Mak and the Celestron C8.

    HIH
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    , 10" Dob Dennis Steele's ETT, SW 180mm MAK, Celestron C8 SCT, 6"
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    Default Re: 180mm Mak questions - Sky Watcher vs Orion

    I bought a used Orion 180 Mak package, but have not as yet used the Scope. It came with a crayford focuser. I am guessing that the crayford eliminates any image jumping during focus and will likely have a finer focus capability. AlanP
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    Default Re: 180mm Mak questions - Sky Watcher vs Orion

    Gearloose,
    Since it's on sale, I'm about to pull the trigger on the S-W version. Here is an interesting review that also mentions adding a focuser:
    Skymax 180 PRO Review
    Thanks for hunting down many answers -- I had the same questions.

    W2SGB
    Original & Current Owner of Tasco 7TE
    Meade ETX90
    Ioptron MiniTowerPro (waiting for a big Mak OTA)
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    Default Re: 180mm Mak questions - Sky Watcher vs Orion

    ^^ great article on the Mak Skymax 180!
    Levenhuk Strike 1000 Pro Mak-Cass / EQ2 Equatorial Mount / 44.5mm to SCT Adapter / Antares 0.63
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    Default Re: 180mm Mak questions - Sky Watcher vs Orion

    Hello Cleary!

    Please be mindful of the dates on the threads you are replying to. Please see the Astronomy Forum Rules and Terms of Service - Part One, The Legal Stuff, especially the section entitled "Dead Thread Revival, aka Necro Posting".

    Thanks much for your understanding. Thread closed.
    Bryan

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