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Thread: Celestron Omni Eyepiece

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    Default Celestron Omni Eyepiece



    Hi, I have a nexstar 130slt and I was concidering getting a 6 or 7mm eyepiece. On amazon at the moment there are Celestron Omni eyepices at reduced prices. Are they any good and suitable for my scope?

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    Default Re: Celestron Omni Eyepiece

    Hello shrubber, the Omni Plossl will work reasonably well in your scope. The build quality is not the best at times.
    If you can find some GSO Plossl these are much better quality and can usually be found for the same or just slightly higher price.
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    Default Re: Celestron Omni Eyepiece

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    Default Re: Celestron Omni Eyepiece

    Quote Originally Posted by Gabby76 View Post
    Hello shrubber, the Omni Plossl will work reasonably well in your scope. The build quality is not the best at times.
    If you can find some GSO Plossl these are much better quality and can usually be found for the same or just slightly higher price.
    Most posts I've seen say that the Omnis are made by GSO and are identical, but they don't seem at all similar to me.
    I really like the couple of Omnis I have , but I also like my GSOs.
    I'd like to know for sure if they are made by the same people or not.

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    Default Re: Celestron Omni Eyepiece

    I have a 40mm Omni and I love it but such a short focal length is another story. I personally won't buy a plossl less than 10mm. The eye relief is too short that you have to stick your eyes to the glass to see something.
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    Default Re: Celestron Omni Eyepiece

    Quote Originally Posted by K4PDM View Post
    Most posts I've seen say that the Omnis are made by GSO and are identical, but they don't seem at all similar to me.
    I really like the couple of Omnis I have , but I also like my GSOs.
    I'd like to know for sure if they are made by the same people or not.
    They probably are made by the same company but only to the QC level that is requested.
    The GSO Plossl performs more consistently than the Celestron I find.
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: Celestron Omni Eyepiece

    I think the Omni and GSO Plossls are significantly different. The Omni, like other Celestron and Sky-Watcher Plossls are distributed by Synta and I feel are very probably manufactured by Synta as well. Synta certainly have the manufacturing expertise and facilities to manufacture eyepieces.

    Omnis3.jpg

    In my experience the Omni series only differ from standard Sky-Watcher/Celestron eyepieces in overall finish. The 17mm Sky-Watcher/Celestron Plossl housing is remarkably similar to the 15mm Omni Plossl, although the Omni has a silver finish. The Omni series seems to be dropping in price recently almost everywhere. Unlike my jpeg (above) Omnis have standard 22mm aluminium drawtubes with an undercut. Mine have been modified with brass smooth drawtubes. The 12mm Omni is particularly good in my experience, I recently used it for over 40 mins lunar viewing convinced it was my 11mm TeleVue Plossl. The extra weight of the brass drawtube made me think it was the TeleVue and in the dark it was difficult to distinguish them. The 15mm is beautifully made and an ergonomically pleasant Plossl to use with a sharp defined field stop quite unlike the 15mm GSO Plossl's fuzzy non-defined field stop. Not that I think the GSO is optically inferior in any way though. It's worth pointing out that Synta tend to recommend these eyepieces are best used in scopes of f/6 and slower.

    GSO6,9,12,15.jpg

    The GSO are slightly more expensive than the Omni and don't have the silver finish that Omni Plossls do. I'm convinced they are made by totally different OEM's. They probably perform better in faster scopes though and I have a feeling the optical glass is manufactured by JOC. The GSO's have aluminium 30mm drawtubes that mostly feature undercuts. The undercut has a flared lower lip however, not unlike TeleVue undercuts, and so would be easier to extract from anything with a compression ring. GSO are slowly phasing all of their undercuts out for smooth drawtubes. The 6mm GSO Plossl, like its 15mm counterpart, also has a fuzzy field stop. Although the other GSO Plossls have very defined field stops. Having said that, it doesn't really affect its performance, and the 6mm GSO is quite sharp and bright compared to other 6mm Plossls I've used. It has the edge on a Celestron 6mm Plossl (from the Celestron Eyeopener Kit) I own and seems a very competent Plossl. It is reminiscent of the Meade 6.4mm Plossl IMO.

    So, for a 6mm Plossl, the GSO would probably be my choice. Although the Omni series can often be just as good in slow scopes, I think the extra bit of money spent on the GSO might be worth it. I've used a few Celestron and other 6mm Plossls but I've not used a 6mm Omni so I can't really be objective.
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    Default Re: Celestron Omni Eyepiece

    Quote Originally Posted by shrubber View Post
    Hi, I have a nexstar 130slt and I was concidering getting a 6 or 7mm eyepiece. On amazon at the moment there are Celestron Omni eyepices at reduced prices. Are they any good and suitable for my scope?
    And the reason they are discounted is they are not that good. 15mm and below particularly bad, cheaply made (eye guard came off my new 15mm just after a couple of uses), dark and bad contrast.

    What other EPs do you have? You will be better off getting 2x barlow and barlowing down your 10-15mm EPs.

    I don't believe they are made by GSO, since OMNIs are made in China and GSO makes their Plossls in Taiwan. I had older Celestron shorty barlow made in Taiwan which looks exactly line GSO's version, some older Celestron Plossls were made in Taiwan to, so they might have been from GSO.

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    Default Re: Celestron Omni Eyepiece

    Quote Originally Posted by Bigzmey View Post
    And the reason they are discounted is they are not that good. 15mm and below particularly bad, cheaply made (eye guard came off my new 15mm just after a couple of uses), dark and bad contrast.

    What other EPs do you have? You will be better off getting 2x barlow and barlowing down your 10-15mm EPs.

    I don't believe they are made by GSO, since OMNIs are made in China and GSO makes their Plossls in Taiwan. I had older Celestron shorty barlow made in Taiwan which looks exactly line GSO's version, some older Celestron Plossls were made in Taiwan to, so they might have been from GSO.
    I have a feeling the early Omnis actually were made by GSO. I've had my 12 and 15mm for a while but they say 'China' on the barrel. At one time the Omni Plossls were more expensive than many of the other mid-priced Plossls and I am convinced it was a bit of a marketing ploy. I think they were originally quite decent Plossls (mine are actually quite good) with a fancy 'up-market' silver finish making them appear a little exotically different in a market saturated with relatively decent mass produced affordable Plossls.

    I'm guessing they weren't as successful as Celestron (Synta) hoped for them and so the build quality has suffered as they try to knock them out ever cheaper.
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    Default Re: Celestron Omni Eyepiece

    Quote Originally Posted by Shorty Barlow View Post
    I have a feeling the early Omnis actually were made by GSO. I've had my 12 and 15mm for a while but they say 'China' on the barrel. At one time the Omni Plossls were more expensive than many of the other mid-priced Plossls and I am convinced it was a bit of a marketing ploy. I think they were originally quite decent Plossls (mine are actually quite good) with a fancy 'up-market' silver finish making them appear a little exotically different in a market saturated with relatively decent mass produced affordable Plossls.

    I'm guessing they weren't as successful as Celestron (Synta) hoped for them and so the build quality has suffered as they try to knock them out ever cheaper.
    I guess current Synta (Celestron/Orion/Skywatcher) Plossls offerings are not bad for starter EPs. But as you say they try to dress them up and pretend they are premium Plossls, why they are not. Older regular looking, made in Japan and Taiwan Plossls perform more consistently.

 

 
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