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Thread: 1.25" or 2"?

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    Default 1.25" or 2"?



    I just bought a Orion SkyQuest XT8 Classic Dobsonian Telescope and with it came a 1.25" 25mm eyepiece. I have the the ability to use 2" eyepieces but am wondering what's the difference? Is it worth the extra money or should I just stick to 1.25" pieces? Thanks!

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    ... for the medium and high power EPs you can stay with the 1.25" format they will serve you just fine ... planetary and lunar viewing for the most part ...

    ... for anything 30mm and up going with the 2" format will give you a little better "light train" ... DSOs and wide angle viewing ...

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    Alright, thanks you. I came along some Orion ED-2 eyepieces that I thought were nice. I was thinking of getting the 9.5mm, 7.5mm ED-2 and a 2x shorty barlow lens. How good would these be? I'm also not sure what the difference between Plossl, Ultrascopic and ED-2 are. Does anyone know?

    Thanks again!

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    Not sure if this is what you are looking for---

    Ultrascopic series with description.
    Orion 30mm, 15mm, and 10mm Ultrascopic Eyepieces - Review

    From a rieview of an Orion ED-2 Eyepiece:-
    "ED" stands for "Extra-low Dispersion" optical glass, a special grade of glass that boasts superior refractive properties compared to standard optical glass.

    Plossl, you will find d description towards the bottom.
    Eyepiece - Wikipedia, the free encyclopedia

    Hope this is of some use to you.

    Cheers

    SC

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    Said it once say it again you only need three EP's and a 2x Barlow

    10m 20, 30mm

    and that will effectively give you

    5,10,15,20,30 mm EP's

    going below 5mm in an EP gains nothing IMO unless you have plentry of aperture and focal length

    Cheers

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    Quote Originally Posted by trevorw View Post
    Said it once say it again you only need three EP's and a 2x Barlow

    10m 20, 30mm

    and that will effectively give you

    5,10,15,20,30 mm EP's

    going below 5mm in an EP gains nothing IMO unless you have plentry of aperture and focal length

    Cheers
    Yes, thank you! I just went through some eyepieces again and decided on the 10mm Orion Sirius Plossl Eyepiece and the 1.25" 2x Orion Shorty Barlow Lens. I'll have x48, x96, x120, and x240! I see there's another barlow that will eliminate chromatic aberration. Is this worth it?

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    Quote Originally Posted by MMaster View Post
    Yes, thank you! I just went through some eyepieces again and decided on the 10mm Orion Sirius Plossl Eyepiece and the 1.25" 2x Orion Shorty Barlow Lens. I'll have x48, x96, x120, and x240! I see there's another barlow that will eliminate chromatic aberration. Is this worth it?

    This is the one I have:

    1.25" 2x Orion Shorty-Plus 3-Element Barlow Lens - Telescope.com

    I use it constantly with a 24mm Stratus, and also with the 9mm Edge-On and and am very pleased with it. Only gripe I have is they don't provide cover-caps for both ends of the barlow, so I am having to improvise to keep it clean.

    Mike
    Last edited by DizzyGazer; 04-12-2009 at 07:08 AM.

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    Quote Originally Posted by trevorw View Post
    Said it once say it again you only need three EP's and a 2x Barlow

    10m 20, 30mm

    and that will effectively give you

    5,10,15,20,30 mm EP's

    going below 5mm in an EP gains nothing IMO unless you have plentry of aperture and focal length

    Cheers
    ... Hey Trev ... just curious ... why not a 10mm, 30mm, and 40mm with a 2x Barlow? ... that would give you the 5mm, 10mm, 15mm, 20mm, 30mm, and a 40mm for DSOs ...

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    Quote Originally Posted by DizzyGazer View Post
    Only gripe I have is they don't provide cover-caps for both ends of the barlow, so I am having to improvise to keep it clean
    I use the collimation cap that came with the scope to cover it, fits perfectly, and even though it has a hole in it it's better than it being wide open and exposed.

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    Quote Originally Posted by FatherGuse View Post
    ... Hey Trev ... just curious ... why not a 10mm, 30mm, and 40mm with a 2x Barlow? ... that would give you the 5mm, 10mm, 15mm, 20mm, 30mm, and a 40mm for DSOs ...
    Assuming we are talking 1¼" EPs then 30mm is about the useful limit with standard plossls. 40mm in an 1¼" standard plossl actually loses FOV.

    If you were talking 2" it would be different

 

 
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