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Thread: EXT 125 & Messier search?

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    Default EXT 125 & Messier search?



    Looking at getting a EXT125 scope in the future. What I would like to know is how does it preform searching out the Messier objects? I have had over
    the years quite a few scopes and because of age must go to a scope this size with go-to and light weight and easy to move.
    Feedback appreciated on this EXT125.

    Thanks Bill

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    Default Re: EXT 125 & Messier search?

    It's a great planetary/lunar scope and also does a good job splitting doubles. It's pretty good on small bright DSOs. But it has a narrow filed of view and the dimmer and/or larger DSOs present serious problems for it.

    I would probably go with the 102 SLT refractor. It has a much wider field of view and a similar light grasp (because of the Mak's central obstruction). The SLT will hold a variety of small to medium sized scopes (the ETX is limited to that one and only scope) and you could use it with a 5" Mak as well (or just buy it with the 127 Mak and get the 102mm refractor later).

    If your main interest had been planetary observation, I would say get the 127 SLT and maybe add the refractor later. But being as it is the Messier list, I say get the 102 SLT and maybe add the 127 Mak later.
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    Default Re: EXT 125 & Messier search?

    EXT125 max FOV is about 1 deg. A few larger Messiers would not fit. Other than that under reasonably dark skies you should be able to resolve them all.

    As Oz I would pick however 127 SLT or 102 SLT over EXT 125.
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    Default Re: EXT 125 & Messier search?

    will a focal reducer work on the ETX 125? Bill
    Burris

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    Default Re: EXT 125 & Messier search?

    I have no idea about a focal reducer may be someone will know.

    Bill

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    Default Re: EXT 125 & Messier search?

    Quote Originally Posted by burris View Post
    will a focal reducer work on the ETX 125? Bill
    Yes. You have two options. A cheap .5x reducer that attaches like a filter to the EP used. This doesn't really work well in MOST cases for a variety of reasons (much of which comes down to it's cheap).

    Or a standard .63x SCT reducer, but you have to get an adapter to fit it on the Mak threads and the reducer is significantly more expensive. This works much better (of course at a higher cost) but usually introduces aberrations at the edge of the field of view.

    I would just rather use the Mak for what it is and get another wide field instrument for that.
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    Default Re: EXT 125 & Messier search?

    Celestron 127mm SLT Mak is F12 while Meade EX125 Mak is F15, which makes Celestron more suitable for DSOs.

    Both of them have baffle tube diameter of 26mm which is about max size of 1.25" EP field stop. If you use .63x reducer and EP with 26mm field stop (like Plossl 32mm) or larger you will not get wider illuminated FOV because it is limited by the baffle tube. Instead you will get about the same illuminated field of view as without the reducer, and the rest will be severely vignetted.
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    Default Re: EXT 125 & Messier search?

    Thanks guys! Was just wondering. Will probably still buy one for my C-8, just wanted to know if it would work on my ETX. Bill
    Burris

 

 

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