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Thread: How good (or bad) are the "included with scope" eyepieces?

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    Default How good (or bad) are the "included with scope" eyepieces?



    Hello!

    Just curious about whats the quality of the eyepieces that come with entry level scopes.

    I have the Astromaster 90 that came with two eyepieces: 10mm and 20mm but it says nothing about their design or number of elements or coatings or FOV? What about their tech specification?
    Are they Plossl design? I guess they have only 3 elements..

    I also have the Nexstar 4Se that came with a 25mm and it clearly says "Plosssl" but show no information about number of elements, coatings, FOV, etc...

    As to me, Im happy with them, so far, Im new into this hobby, but curious about the overall quality and spec of these 10mm, 20mm and 25mm basic eyepieces? (For me, they do their job well...)


    Thanks!
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    Default Re: How good (or bad) are the "included with scope" eyepieces?

    The eyepiece that came with the Nexstar is a good eyepiece to start with ,my C5 Celestron had one but sadly I have lost it.The others are Hmmm not the best, just there so you can use your Telescope.
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    Default Re: How good (or bad) are the "included with scope" eyepieces?

    Surprisingly good for what they are but better eyepieces await you.
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    Default Re: How good (or bad) are the "included with scope" eyepieces?

    The ubiquitous Celestron 1.25" 10mm and 20mm, unspecified eyepieces that are included with many of Celestron's entry level scopes are 3 element Kellner eyepieces with a 50º AFoV. I measured a 51º AFoV on ones I own, so Celestron's specs on them are accurate. Considering the cost of the scopes that include these "freebies", they're both pretty decent eyepieces.

    Celestron 20mm Light Weight Binoviewer Eyepieces (set of 2)

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    Default Re: How good (or bad) are the "included with scope" eyepieces?

    Quote Originally Posted by dilapo View Post
    The ubiquitous Celestron 1.25" 10mm and 20mm, unspecified eyepieces that are included with many of Celestron's entry level scopes are 3 element Kellner eyepieces with a 50º AFoV. I measured a 51º AFoV on ones I own, so Celestron's specs on them are accurate. Considering the cost of the scopes that include these "freebies", they're both pretty decent eyepieces.

    Celestron 20mm Light Weight Binoviewer Eyepieces (set of 2)
    I have the Celestron Power seeker kit that has a 15mm Kellner and a 9mm Kellner eyepiece they are surprisingly good if I want to look at Planets or the moon. The field of view is narrow so everything is more defined. I would love to get a good set of 4 to 15mm Kellner for planetary use. The Plossl 25mm that came with my Nexstar 8 SE is very good too. I just wish that Celestron had 2 eyepieces with the scopes like a 10 or 12 Plossl to go with the 25mm.
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    Default Re: How good (or bad) are the "included with scope" eyepieces?

    A true Plossl is always 4 elements in 2 groups. The Celestron Plossl is not a bad eyepiece at all and will serve you well while your starting out.
    Kellners and Erfles are another good eyepiece design but do the best in longer focal length scopes such as f/7 and slower refractors and Mak/ SCT scopes.
    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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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
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    Default Re: How good (or bad) are the "included with scope" eyepieces?

    Both of your scopes are slow (F>10). One of advantages of slow scopes that they are not picky about EPs, and even budget EPs should do a descent job. The disadvantage is that field of view is narrow, so eventually you may want to add 32mm Plossl to get the max FOV for your scopes.
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    Default Re: How good (or bad) are the "included with scope" eyepieces?

    I found the eyepieces that came with my Z10 to be adequate, but not great. But I did use them for three years before getting some higher quality oculars. One was an Erfle design, the so-called 30mm Superview and the other a 9mm Plossl. I used the Superview to complete the Messier project and the Plossl for things like planetary nebulas and the planets themselves. I found the eye-relief on the 9mm to be pretty uncomfortable though. So, my advice is to use the supplied eyepieces for awhile as you learn your way around the night skies and get acclimated to your scope.
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    Default Re: How good (or bad) are the "included with scope" eyepieces?

    Thanks all of you very much for your interesting answers. Im happy with my basic eyepieces so far!
    I appreciate your time!
    Great forum!
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    Default Re: How good (or bad) are the "included with scope" eyepieces?

    I'm pretty sure the 'Celestron' 25mm Plossl is Synta-made and exactly the same as other Celestron, Sky-Watcher and some Orion Sirius Plossls.

    Sirius25.jpg

    I have the 25mm Orion Sirius which is the same eyepiece as its Celestron equivalent. It's a genuine Plossl design.

    The other two eyepieces in your picture are probably Synta Kellners. Whether it is a reversed Kellner design similar to the Sky-Watcher MA eyepieces included with their scopes I don't know. Traditionally Kellners suffered from some chromatic aberration but modern coatings improved that.

    25mm.jpg

    The Sky-Watcher 25mm MA (Modified Achromat) usually included with their scopes is quite usable although the upper body is plastic.

    1.25 15mm.jpg

    I have a 15mm Celestron Kellner (above), although it is also plastic bodied, it gives a nice wide field view. It only has about a 50° field of view but its wide field stop and 2cm eye lens, typical of Kellner designs, make it quite pleasant to use and I sometimes use it as a finder eyepiece for this reason. My Orion 25mm Sirius was included with my StarMax and the Sky-Watcher Kellners were also included with Sky-Watcher scopes. The 15mm Celestron Kellner was from the Celestron AstroMaster Kit.
    Last edited by Shorty Barlow; 03-03-2017 at 01:47 PM.
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