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Thread: 18-22mm Hole Needs Filling

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    Default 18-22mm Hole Needs Filling



    If you caught my beginning Messier run over in that area, I’m looking to fill the 18-22mm hole in my EP lineup. I currently have a Celestron Ultima Duo 10mm and an Orion Q70 38mm. I am looking at the Ultima Duo 21mm, the Baader Hyperion 21mm and the ES 2” 82 Series 18mm. I see both the Hyperion and ES 82 series have good followings here. Using SkySafari Pro to simulate the FOV, there is not a significant difference between 18 & 21mm. I need the EP to be either 2” or one of the hybrids that work in a 2” barrel without an adapter due to FR challenges. I am also not hung up on one brand over another at this point, what does everyone recommend – or is there one I missed in that quality range?


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    Default Re: 18-22mm Hole Needs Filling

    I prefer the view through the ES 18mm over the Hyperions. I've got both. The contrast is better and it's better corrected at the edge (F/5 Dob).
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    Default Re: 18-22mm Hole Needs Filling

    I've read some good reviews on the Olivon 22mm. It's a 70 degree, 2" eyepiece. But I have never looked through one personally.
    Many folks around here seem to be in love with the ES82 18mm you mentioned. So I don't think you can go wrong with that one.
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    Default Re: 18-22mm Hole Needs Filling

    I have a complete set of Hyperions (5-31mm) and a complete set (plus two duplicates) of the ES 82o eyepieces (4.7-24mm).

    Across a wide range of telescopes from f/4.7 to f/10, both sets work fine. However, the Hyperions are just ever-so-slightly dimmer overall than the ES. The Hyperions have a consistent eye-relief of 20mm, whereas the ES vary slightly from around 20mm to 14mm... neither is a big deal unless you have a severe astigmatism.

    If God were to stick a gnarled finger out of the sky and declare, "John, from this day forth you may only use one eyepiece."... I would choose the 2" 18mm ES 82o. (I have two of 'em.)

    Overall, the Hyperions are slightly heavy due to their modular design. The lightest Hyperion is the 24mm, but it is the only one of the series that is not modular... and it's the "weakest" link in the series. I use mine as a permanently-mounted eyepiece in the ST-80 finderscope that is on the left in my avatar.

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    Default Re: 18-22mm Hole Needs Filling

    Russell Optics Research Grade 18mm Super-Wide Konig or 19mm Super-Wide Konig.
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    Default Re: 18-22mm Hole Needs Filling

    That ES 18 is my workhorse, and I'm really happy with it.
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    Default Re: 18-22mm Hole Needs Filling

    ES 18mm 82 no doubt.
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    Default Re: 18-22mm Hole Needs Filling

    Are you looking for something to work for a specific scope or both of yours?
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    Default Re: 18-22mm Hole Needs Filling

    As far as quality, the ES 82 18mm is definitely better. The Hyperions are okay but nothing special, particularly in faster scopes such as my f/4.5 and f/5 dobs. I used to own several Hyperions, but in direct comparison to the ES 82s, well there was no comparison in my scopes with my eyes. I sold all of my Hyperions and haven't missed them a bit. In your C8 the Hyperions would do fine given the slower optics, but in your f/5 refractor they wouldn't perform at their best. The ES 82s are simply better corrected. The ES 82 18mm is my DSO hunting eyepiece of choice in my 10 and 12 inch dobs.
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    Default Re: 18-22mm Hole Needs Filling

    Quote Originally Posted by Gabby76 View Post
    Are you looking for something to work for a specific scope or both of yours?
    Both, plus an ES AR152 that will be added this fall.
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