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Thread: Celestron Omni XLT 120

  1. #1
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    Default Celestron Omni XLT 120



    I got to take my scope out for just the second time since buying it and I must say the viewing was quite a bit more pleasing...First of all cold...lol...I think it was 24 degrees...but the sky was quite a bit darker...no moon up yet...so optically a much more satisfying view than my first night.I still have just the single eyepiece "25mm" 1.25...but going to Chattanooga to watch the National Championship and my nephew said he would let me borrow his barlow and some of his eyepieces.I know one of his eyepieces is a Teleview Nagler...don't know which one ..but it should be fun trying out some more stuff on the scope.I only gave $494 for it,there wasn't any shipping nor tax,so i feel one of the best deals out there for a starter scope.I forced myself to buy one without the GoTo feature to learn the "old school" way of doing things so to speak....But I didn't realize "I'm in my upper forties now"...the twister game you sometimes play because of the position of the scope...lol. It's not that i mind it,but i am going to have to get a little faster at finding things..all the blood left my arm quite a few times adjusting the slow motion controls.Overall so far...I'm liking what I bought.
    AbbN, Pitter, Lowjiber and 3 others like this.

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    Default Re: Celestron Omni XLT 120

    Welcome to the forum, I have the same scope , but upgraded to 2" parts for the ep's I love the scope everything is super clear through it
    sanity in an insane world is insane

    Scopes - Celestron Nexstar 102 GT,Celestron Astro Master 60mm refractor,Skywatcher ST80
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    Default Re: Celestron Omni XLT 120

    I was wondering about about 2" eyepieces...whether or not they are worth the upgrade...I have tried to research it ...but i get a bit lost in the translation...when I look at Teleview...not that I can afford one..lol...I see that there 2" eyepiece stop at around 17mm...and as far as the placement of a barlow,where in the loop does it go...i know they are making combo eyepieces that are both 2" and 1.25"...I don't understand the theory behind that either...do they start 2inches and then are reduced down...or is it the other way around and the 2"barrel is the add nonacid if this is the case..don't you lose a lot of fov???As you can see I'm lost when it comes to the 2" setup...But I would upgrade to that for the Bigger fov if it is worth it...But I'm under the impression that higher magnifications are essentially for 1.25" eyepieces....can someone help me iron this out...

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    Default Re: Celestron Omni XLT 120

    I have a 2" diagonal the mirror part that replaces the original , it has an adapter to reduce it down to 1.25" so to use my 2" EP I remove the adapter.

    My Barlow is 2x and 1.5x it splits as well as adapting to both 2" and 1.25" eps and attaches under the EP . But normally the Barlow goes in the diagonal and then the EP goes in the Barlow.

    I git mine off eBay, the EP is a panaview SWA 26 and the diagonal an opticron dielectric , the Barlow is an unbranded ED glass and a bargain , I think I got the whole lot for less than £150
    fleetwooddave likes this.
    sanity in an insane world is insane

    Scopes - Celestron Nexstar 102 GT,Celestron Astro Master 60mm refractor,Skywatcher ST80
    Opticron Oregon 11x70 Observation Binos
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    Cameras - Nikon D5300, Sigma 300mm Telezoom, Nikkor 35mm f/1.8, Macro convertors, Sigma 10-20mm F3.5, Nikkor 70-300 AF-P

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    Default

    At higher magnifications, you're only looking at the central part of the image formed by the scope, so a 1.25" eyepiece is fine.

    As you decrease the magnification (longer eyepiece focal length) or increase the apparent field of view (size of the circle you see the image in) at the same magnification, you see more of the image formed by the scope.
    Eventually you reach a point where you're seeing all of the scopes image that will fit in a 1.25" barrel - so if you want to see more you need to switch to the larger 2" barrel size.

    So for higher magnifications, 1.25" is all you need and there is no optical benefit in a 2" version.
    But for low power, wide field views, a 2" eyepiece can show you more - which is why most people that can use them prefer 2" at low powers.

    The dual barrel eyepieces are basically a 1.25" design with a 1.25" barrel and either a second, shorter, 2" barrel around it, or a 2" lower body - so you can plug the eyepiece into either a 1.25" or 2" focuser. But optically, it's still a 1.25" eyepiece; using it in a 2" focuser doesn't change the field of view - it just means you don't need to use a 1.25" to 2" adapter.
    fleetwooddave likes this.

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    Default Re: Celestron Omni XLT 120

    This helps me a lot...I was having a hard time understanding why 2" eyepieces were not used at high magnifications..but the fact that the image is "still relatively small"...I take it that as to why 1.25" is all that is necessary...Thank you guys so much

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    Default Re: Celestron Omni XLT 120

    Old school is the way to go I have faster 120mm refractor on manual alt/az and enjoy it quite a lot.

 

 

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