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Thread: Celestron Omni

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    Sixfalls's Avatar
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    Default Celestron Omni



    I just posted a very positive review for the Celestron Omni Plossl eye-pieces on the Agena web-store. I have nicer eyepieces, but it really is nice to be able to get something of this quality for less than $30. It really comes in handy when you are allowing kids to view through your scope. There is always that one time, when you ask someone to, "Hold this", then you hear the eyepiece make that sick thud sound. When that happens it is nice to be able to retain your smile and composure. Yet, the Omni still gives me a level of quality that I am happy with. Fully multi-coated optics, without much ghosting and without my edges being very fuzzy. It is worth noting that I am using these in longer focal length scopes, (f/8 & f/10). Results may be different in a 254mm - f/4.7. Plus, some of us must put the kid's college, and the wife's wants above a Tele-Vue, not that they are not worth the money, but I think the return on investment is somewhat reduced in a longer focal ratio scope. I also, have GSO Plossls, which I am pleased with, but I like the recess in the Celestron draw tube, and the nice classy finish on the Omni's as well. Optically, I can't tell the GSO Plossl from the Celestron Omni Plossl. For whatever odd reason, I can't find an Omni 20mm or 25mm, so I have these in GSO and Orion Sirius, Both have performed nicely as well. I do have to admit, that as much as I am an Orion fan, I feel that the GSO and the Celestron Omni out perform the Orion Sirius EP, at least in my scope for my eyes. To the extent that I will be replacing it with a GSO 25mm on some rainy day when I need a treat.
    Last edited by Sixfalls; 11-06-2018 at 02:34 PM.
    Orion Skyquest XT6 f8 / Orion 70mm f/10 EQ (Dobsonian & Refractor)
    EP's: 40mm, 25mm, 20mm, 18mm, 15mm, 10mm, 9mm, 6mm (X-Cel-LX, BST, Expl-Sci, & GSO)
    Binoculars: Nikon 8x42, Celestron 12x60
    Filters: 82A, 23A, #12, polarizer, neodymium
    Experience Level: Entering 2nd year in astronomy
    Favorite Quote: "Darkness cannot drive out Darkness; only light can do that. Hate cannot drive out hate; only love can do that." Dr. Martin Luther King

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    Default Re: Celestron Omni

    The Omni Plossl is a nice eyepiece, and they should deliver very good views with your longer focal length telescopes.
    Your faster reflector may show the field along the edge a bit soft but on axis will still perform well.
    Bigzmey likes this.
    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
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2" Orion Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
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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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    Default Re: Celestron Omni

    I have started with Plossls over twenty years ago, and still recommend them as starter EPs. Most of older Plossls are still a sure thing. Now days the quality could get patchy, but if you happen to get a good sample they still deliver.

    If you are looking to feel gaps in your Plossl line-up consider Meade Series 4000 Plossls. I had a whole set at one point and still have a few. I believe they perform at similar level as Celestron and GSO. I would consider all 3, but not a big fan of Orion Plossls or Orion modern EP selection in general.
    j.gardavsky and craigwithers like this.

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    Default Re: Celestron Omni

    Everyone needs to have a set of orthos and plossls. And my number one 32mm is also the Celestron. Plossls work good in f5 scopes because they do not try to be the widest angle. Just a really good 52 degrees pinpoint stars to the edge.
    Newtman but some refractors allowed.

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    Default Re: Celestron Omni

    They're pretty good at f/6 and slower.



    I've always wondered who make these.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: Celestron Omni

    Quote Originally Posted by Bigzmey View Post
    I have started with Plossls over twenty years ago, and still recommend them as starter EPs. Most of older Plossls are still a sure thing. Now days the quality could get patchy, but if you happen to get a good sample they still deliver.

    If you are looking to feel gaps in your Plossl line-up consider Meade Series 4000 Plossls. I had a whole set at one point and still have a few. I believe they perform at similar level as Celestron and GSO. I would consider all 3, but not a big fan of Orion Plossls or Orion modern EP selection in general.
    I'm pretty certain 'Orion' Plossls are made by Barsta, like 'Celestron' and 'Sky-Watcher' Plossls. They all come out of the same factory, just with different names on them. Orion Sirius Plossls differ in the fact that they have smooth drawtubes. I have an 8mm Orion Sirius Plossl and an 8mm Sky-Watcher Plossl. Apart from the draw tubes they are identical.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: Celestron Omni

    Quote Originally Posted by Shorty Barlow View Post
    I'm pretty certain 'Orion' Plossls are made by Barsta, like 'Celestron' and 'Sky-Watcher' Plossls. They all come out of the same factory, just with different names on them. Orion Sirius Plossls differ in the fact that t-Coated"hey have smooth drawtubes. I have an 8mm Orion Sirius Plossl and an 8mm Sky-Watcher Plossl. Apart from the draw tubes they are identical.
    You know there's another dfference i've found. My Sirius PLossl are printed with "Multi-Coated", My Omni Plossls are printed "Fully Multi-Coated". I recently asked Orion what the differece was, and they told me, "Not every (Air-Glass Surface), recieves multiple coatings in a "Multi-Coated" EP. Thier difinition of Multi Coated is below:

    (Coated, Multi
    All air-to-glass surfaces are coated with at least one layer of magnesium fluoride, with some surfaces receiving multiple anti-reflection coatings. A step up from "fully coated", but not quite as good as "fully multi-coated".)
    Orion Skyquest XT6 f8 / Orion 70mm f/10 EQ (Dobsonian & Refractor)
    EP's: 40mm, 25mm, 20mm, 18mm, 15mm, 10mm, 9mm, 6mm (X-Cel-LX, BST, Expl-Sci, & GSO)
    Binoculars: Nikon 8x42, Celestron 12x60
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    Default Re: Celestron Omni

    Quote Originally Posted by Sixfalls View Post
    You know there's another dfference i've found. My Sirius PLossl are printed with "Multi-Coated", My Omni Plossls are printed "Fully Multi-Coated". I recently asked Orion what the differece was, and they told me, "Not every (Air-Glass Surface), recieves multiple coatings in a "Multi-Coated" EP. Thier difinition of Multi Coated is below:

    (Coated, Multi
    All air-to-glass surfaces are coated with at least one layer of magnesium fluoride, with some surfaces receiving multiple anti-reflection coatings. A step up from "fully coated", but not quite as good as "fully multi-coated".)
    I don't know for certain but I suspect the Omni series of Plossls are specially made by Barsta for Celestron (Synta). So they could be made to slightly different specifications.



    1.25" Flat & Plossl & Kellner & Super eyepiece

    The Barsta Plossls also differ in that there is no 6mm and 12mm. I don't know if 'multi coated' and 'fully multi coated' are necessarily different or just marketing terms. I can't tell any coating difference between my Orion, Celestron or Sky-Watcher Plossls. There may be though.
    Last edited by Shorty Barlow; 11-07-2018 at 05:10 PM.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: Celestron Omni

    I've just realised that the Orion and Sky-Watcher pair that I have are 7.5mm rather than 8mm.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: Celestron Omni

    Quote Originally Posted by Shorty Barlow View Post
    I'm pretty certain 'Orion' Plossls are made by Barsta, like 'Celestron' and 'Sky-Watcher' Plossls. They all come out of the same factory, just with different names on them. Orion Sirius Plossls differ in the fact that they have smooth drawtubes. I have an 8mm Orion Sirius Plossl and an 8mm Sky-Watcher Plossl. Apart from the draw tubes they are identical.
    Even if they come from the same factory, the fit and finishes could be different. A few of Orions EPs went through my hands, none stayed. The most awful EP and focusers I had came from Orion. I may just been unlucky, but if you get burned a few times by the same brand, would you stick to it or recommend to others?

 

 
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