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Thread: Thinking about a new EP, and not sure

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    Doug James's Avatar
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    Default Thinking about a new EP, and not sure



    I have some Orion Stratus EP's and am thinking of 5MM Stratus for use with my Celestron Omni XLT 120,f/8.33 Refractor.
    My question is will that max it out so it ends up being used only on the odd very clear night? The 8mm works Great so was thinking Maybe go for a little more.
    Last edited by Gabby76; 12-18-2018 at 12:35 AM. Reason: Fixed message context :)
    Celestron Omni XLT 120 Refractor, Orion XT8 Classic Dobsonian - Telrad finder - Sirius Plossl 1.25" eyepieces 40mm,25mm,17mm,
    Shorty 2x Barlow lens, Orion Stratus 8mm,13mm,21mm, Baader 36mm, Meade 6.5mm,
    Binoculars, Nikon 10x50

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    Default re: Thinking about a new EP, and not sure

    In average conditions, the maximum magnification you can realistically use will be 8.33mm. (Easy formula: the eyepiece focal length is equal to the scope's focal ratio.) You will likely get some use out of the 5mm, but you will only be happy with the view in excellent conditions. One exception is the Moon: the 5mm will probably be fine on the Moon.

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    (pier);
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    Default re: Thinking about a new EP, and not sure

    You mean EPs?
    You can enter all of your numbers into here and it will let you know if it is within usable range of your telescope. N.A.A. Telescope Math Calculator
    The 5mm will work for a lunar/ double star eyepiece quite well.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    Default Re: Thinking about a new EP, and not sure

    LOL yes EP's
    Celestron Omni XLT 120 Refractor, Orion XT8 Classic Dobsonian - Telrad finder - Sirius Plossl 1.25" eyepieces 40mm,25mm,17mm,
    Shorty 2x Barlow lens, Orion Stratus 8mm,13mm,21mm, Baader 36mm, Meade 6.5mm,
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    Default Re: Thinking about a new EP, and not sure

    What ladies say. Seeing permitting, 5mm EP will be useful for Moon, planets and doubles.

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    Default Re: Thinking about a new EP, and not sure

    Personally, I would be more interested in a 6mm. It would match well with your f/6 Dob for high power and be useful more often in the refractor than a 5mm.

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    Default Re: Thinking about a new EP, and not sure

    Quote Originally Posted by Ozman13 View Post
    Personally, I would be more interested in a 6mm. It would match well with your f/6 Dob for high power and be useful more often in the refractor than a 5mm.
    Or go for the middle ground between 5mm and 6mm

    https://www.bhphotovideo.com/c/produ...BI%3A514&smp=Y
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    Default Re: Thinking about a new EP, and not sure

    Quote Originally Posted by Gabby76 View Post
    N.A.A. Telescope Math Calculator
    LOL. My club is famous.
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    Default Re: Thinking about a new EP, and not sure

    Quote Originally Posted by Don Alvarez View Post
    Or go for the middle ground between 5mm and 6mm

    https://www.bhphotovideo.com/c/produ...BI%3A514&smp=Y
    It sure looks good with 82° field of view, and priced where I want to be as well. Do you not think it's drawing a fine line between workable and unworkable with the Omni XLT 120 ?
    Celestron Omni XLT 120 Refractor, Orion XT8 Classic Dobsonian - Telrad finder - Sirius Plossl 1.25" eyepieces 40mm,25mm,17mm,
    Shorty 2x Barlow lens, Orion Stratus 8mm,13mm,21mm, Baader 36mm, Meade 6.5mm,
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    Default Re: Thinking about a new EP, and not sure

    Quote Originally Posted by Doug James View Post
    It sure looks good with 82° field of view, and priced where I want to be as well. Do you not think it's drawing a fine line between workable and unworkable with the Omni XLT 120 ?
    For the target we discussed (Moon, planets, doubles) and under good seeing conditions Meade UWA will work fine with your scope. Meade UWA and ES 68 and 82 have the same (great) optical quality.

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