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Thread: Orion Expanse Eyepieces

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    Question Orion Expanse Eyepieces



    I own a few Orion Sirius Plossl eyepieces at 52º FOV and for the most part I'm ok with them. I would like to upgrade to a wider FOV like the Orion Expanse Wide-Field 66º EP's and was wondering if anyone here has used both these EP's and if it was worth the upgrade.

    my concern is that if you upgrade would I loose or have a trade off from moving from one to another, would this be an upgrade in EP quality aswell or just an upgrade in FOV? I asking as there isn't much of a price different between the 2 EP's. I have spent the last 3 hours on the web searching for info on this subject.

    just as a side note: I have ordered a StarBlaster 6i as a second scope. and I still have a Xt8 I will be buying a set of Orion Q70 2" lenses as well in the future for my Xt8.


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    One problem with the 15mm I had is that the thread for filters were different compared to the other eyepieces I had. Any filter I tried to put on wouldn't work. Now it's possible I had a defective one, so you should find out from other people if they have the same problem.

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    The wide field designs require another lens so the cost goes up a bit along with expectations. So they typically put a tighter quality control on the ep and often use better coatings. The ones I have are better than a plossl by quite a margin.

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    If you decide to get the Expanse, you can get the identical eyepiece from Agena Astro for a lot less money. They call it a Extra Wide Angle. I have the 9mm and it is pretty good for DSO. The outer edge is not perfect, but you would have to pay a lot more to get perfect edge performance from an eyepiece. I like having the extra field of view compared to a Plossl and especially the much more generous eyerelief. The 6mm is also supposed to be good, but most people seem to dislike the 15 and 20mm.
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    the 15mm & 20mm along with the 9mm would be the ones I would like to buy, but if it's not clear & sharp to the edge of the lens then I wouldn't be happy with them.

    I have a very good pair of Bino's for hunting and they are crisp & clear to the edge & that makes a big difference when using them for a long period of time. if it is fuzzy your eyes tend to get tired faster the same goes for spotting scopes.
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    Hi Brocolt,
    I have the similar eyepieces from Owl Optics. Their version is called Enhanced Super Wide. I found the 9mm to be the best for my set up, and I use it all the time. I start with an Orion Highlight 32mm and when needed switch to the 9mm. I bought the 15mm, 9mm, and 6mm, and recently sold the 15mm since I hardly used it. As I said, I love the view through the 9mm over the Sirius 10mm (also sold due to lack of use).

    As to whether this is an upgrade, for me it was. I have older eyes that now need reading glasses. I found the increased eye relief of the Enhanced (and the Expanse) to be just perfect, making view so much more pleasurable. When I directly compared the 9mm Enhanced to the Sirius 10mm, it was no contest. But that was most likely due to the eye relief, making it so much easier to focus my eye. I do remember the FOV being better in the 9mm, but the stand out was eye relief. I hope this can help!

    My disclaimer is that I am fairly new to using a telescope and haven't been able to do any head to head comparisons of various eyepieces. I have been very pleased with this type of EP.

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