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Thread: 30-32mm EP for an AR102

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    Default 30-32mm EP for an AR102



    I have an ES AR 102. My current highest EP is an ES 20mm 68* which gives me about 33x. I would like opinions on an EP that will give me a magnification in the low 20's with an exit pupil of less than 5mm- a 30mm or 32mm EP. My questions:

    1. Plossl or another design such as an ES 68*?

    2. A 1.25" or 2" barrel?


    Thanks very much.
    Last edited by michael131313; 08-06-2018 at 12:42 AM.
    ES AR 102 102mm, f/6.5, Orion Starblast 4.5 114mm,f/4 , Celestron 10x50, GSO SV 30mm, ES 68° 20mm, ES 82° 14mm, 11mm, 8.8 mm, 6.8mm, 4.7mm. Twilight 1 mount.

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    Default Re: 30-32mm EP for an AR102

    A 32mm Plössl would do the trick and be quite economical. The GSO's are good eyepieces for the cost.

    If you want a bit wider of an AFOV, the ES 62° series 32mm might be a good option, though I have not looked through one.

    How much are you looking spend, Michael?
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    Default Re: 30-32mm EP for an AR102

    An interesting twist on the 32mm plossl might be this one I found on Ebay. Listed as a FMC two inch 32mm "Super Plossl" with a 68* AFOV. I don't know anything about them, but they are coming out of China like so many eyepieces one finds on Ebay, and sometimes one can find a hidden gem.

    Says its a plossl, but I do have to wonder about the AFOV claims. Super plossl is a marketing ploy to make one think they are getting something unique. Many of the "supers" are still of the 4-element design, while a few may be 5-elements in a 2:1:2 config similar to an Erfle. They certainly don't give any details. So I think it would fall under the category of buy at your own risk.

    https://www.ebay.com/itm/2-inch-32mm...mm+plossl.TRS0
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    Default Re: 30-32mm EP for an AR102

    The GSO Superviews at 30mm and 40mm are quite capable and very economical!

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    Default Re: 30-32mm EP for an AR102

    Most of the time I am quite happy with 1.25" 4 element 50 deg Plossls. They do nicely in all my fracs. The only advantage of 2" is wider FOV. On occasion you do want to max your FOV for walking the Milky Way, or huge targets like Andromeda or Pleiadies. I like Baader Aspheric 72deg 31mm. I tried a few 2" EPs series, but this is the one for me.

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    Default Re: 30-32mm EP for an AR102

    Quote Originally Posted by KT4HX View Post
    An interesting twist on the 32mm plossl might be this one I found on Ebay. Listed as a FMC two inch 32mm "Super Plossl" with a 68* AFOV. I don't know anything about them, but they are coming out of China like so many eyepieces one finds on Ebay, and sometimes one can find a hidden gem.

    Says its a plossl, but I do have to wonder about the AFOV claims. Super plossl is a marketing ploy to make one think they are getting something unique. Many of the "supers" are still of the 4-element design, while a few may be 5-elements in a 2:1:2 config similar to an Erfle. They certainly don't give any details. So I think it would fall under the category of buy at your own risk.

    https://www.ebay.com/itm/2-inch-32mm...mm+plossl.TRS0
    Agreed. Looks Erfle like. The 68 degree afov means it's unlikely to be a pseudo Masuyama / Astroplanax design which usually comes in at 50 not 68.
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    Default Re: 30-32mm EP for an AR102

    Thanks everyone. Good info.
    Bryan, of course I want to spend as little as possible. I really don't see this eyepiece as other than a finder one and to look around. I am pretty happy with my ES 20mm 68* . I like n_FA's idea on GSO. Of course I will need some clear nights, which are few and far between.
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    Default Re: 30-32mm EP for an AR102

    My ES 30mm 82° pineapple err EP is my favourite EP for my AR102 - absolutely love it! The reason I say "pineapple" is because it weighs 35 oz It's ain't cheap but I feel it is well worth the $$

    Abb
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    Default Re: 30-32mm EP for an AR102

    Thanks Abb. I like all my ES EPs, so it's not a bad idea. I know it ain't cheap, but maybe my wife will win a little at the casino! That is if she tells me.
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    Default Re: 30-32mm EP for an AR102

    Hi Michael,

    I agree with what has been said above. A 32mm plossl would work really well, and give you the maximum possible true field for a 1 1/4" eyepiece, but as has been said if you want to maximise your field then you will need to go for a 2". Have a play with the Televue eyepiece calculator. This is for TV eyepieces of course, but the ES series are pretty similar in specs, so it gives es a pretty good idea of what you can do. Tele Vue Optics: Calculator

    I have a GSO Superview 42mm which will give you a 6.5 mm exit pupil. It is quite a nice eyepiece and great value for money, but it doesn't like faster scopes, and I think you will get a fair bit of edge distortion in your AR102. It is much happier in SCT's with f10 or slower. It also doesn't have the full 68° AFOV (or 65°) claimed: more like 57°: see the discussion here: Are GSO Eyepieces FOV Bogus?

    The 32mm "pineapple" that Abb uses will give you just about the biggest FOV you can get with your scope, or alternatively the ES 40mm 68° will give a slightly bigger FOV. Of course once you get over the 6mm exit pupil it will depend on whether your eyes will open that far! Sadly, as we get older our exit pupil tends to get smaller... Both these eyepieces are many times the price of the GSO of course.

    Good luck with that Casino win!

    All the best,

    Dean

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