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Thread: ES 82 deg series EPs

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    Default ES 82 deg series EPs



    So I'm looking to dip my toes into the world of premium EPs and plan to pick up an ES 82 deg series EP. I want this EP to be as close to a 2mm exit pupil as I can which means a 20mm FL. they make an 18mm & a 24mm which gives me 1.8mm & 2.4mm exit pupils. Besides the difference in magnification is there some other reason(s) to look at one vs the other?
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    Default Re: ES 82 deg series EPs

    The 24mm is significantly larger and heavier than the 18mm. The 18mm is my most used EP and the one I would choose.
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    Default Re: ES 82 deg series EPs

    Quote Originally Posted by Nimitz View Post
    So I'm looking to dip my toes into the world of premium EPs and plan to pick up an ES 82 deg series EP. I want this EP to be as close to a 2mm exit pupil as I can which means a 20mm FL. they make an 18mm & a 24mm which gives me 1.8mm & 2.4mm exit pupils. Besides the difference in magnification is there some other reason(s) to look at one vs the other?
    Yes. If you go back through the EP subforum here, you'll probably find most owners of the series seem to universally agree the 18mm ES 82° is their favorite and the pick of that litter. I don't own them personally, but I've heard that notion espoused so many times it must be true. Someone will come along and agree with me. Watch.


    edit: Rather, someone will post ahead of me and agree. See!

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    Default Re: ES 82 deg series EPs

    The 24mm and the 18mm are both amazing eyepieces, but as Oz mentions, there is a notable size difference.



    They both perform wonderfully in my f/5 12" dob or my f/6.4 5" frac.

    If size wasn't a consideration, I'd be inclined to err on the upper side of the 2mm exit pupil. Either one of these will be nice performers if you pull the trigger on a 14" dob as you've mentioned elsewhere.
    Bryan

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    Default Re: ES 82 deg series EPs

    One weighing in at 13.2oz & one at 24.6oz, on your 9.25/CGEM would probably be a negligible difference. If aiming for exit pupil I would probably tend to steer toward the upper of the two , simply for the fact that it would used in a CAT and you will have a slight bit of light fall-off due to the CO of the secondary mirror. On the faintest of objects it can sometimes make a big difference. Ahhh, decisions decisions!
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    Default Re: ES 82 deg series EPs

    Excellent eyepieces. The 24mm is the first eyepiece I grab when using my 8-inch SCT.
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    Default Re: ES 82 deg series EPs

    Yeah, for an SCT go for the 24.....
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    Default Re: ES 82 deg series EPs

    Quote Originally Posted by not_Fritz_Argelander View Post
    Yeah, for an SCT go for the 24.....
    If you wind up getting the Dob it's still useful as a finder eyepiece and for getting tough objects from dark sites.
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    Default Re: ES 82 deg series EPs

    From my experience, for max contrast is better to go slightly below 2 mm, so 18mm over 24mm.

    But why compromise? ES 68 deg 20mm is great EP and will give you 2mm exactly in your SCT. I tested it side by side with ES82 18mm in my 8" SCT. I was never able to see whole 82 deg in 18mm due to very tight eye relief and other than FOV I liked ES68 20mm better.
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    Default Re: ES 82 deg series EPs

    Just split the difference and get the ES 20mm 100°.
    In my 11 inch SCT, it's my favorite eyepiece.

    ES_Eyepieces.jpg
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