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Thread: Explore Scientific 70°

  1. #1
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    Default Explore Scientific 70°



    Hello

    Lately I've been seeing these eyepieces popping out on ebay and the like. They offer 70° AFOV and seem to be Bresser/ES. My question is: have any of you used one of these? Are they any good? They seem relatively cheap (around US$100 with shipment) and it happens that I'm thinking of buying a better, wider AFOV eyepiece (I only have 50° AFOV on my set). Would this EP go well with a 150/750 reflector or a 76/1200 refractor?
    Or should I go with a "true" ES-68° 14mm?
    s-l1600.jpg

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  2. #2
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    Default Re: Explore Scientific 70°

    It should work fine in your refractor but the view may get a bit fuzzy off axis with the reflector.
    Best used with telescopes above f/7 I would say.
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  3. #3
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    Default Re: Explore Scientific 70°

    Go with the ES 16mm 68 or the 14mm 82 if you plan to use it with the reflector. The ES 70 is an Erfle design and a total mismatch for the Newt. It will work OK (still not the quality of the 68s or 82s or even the newer 62s) in the slow refractor. I have a vintage Tasco 10TE 76/1200 probably very similar to your refractor, excellent planetary views. I prefer Orthos in the refractor at higher magnifications, but the ES 68s and 82s in the Newt always and for the refractor at lower power wide field.

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    Default Re: Explore Scientific 70°

    I have the 25mm (two of them, actually) and the 15mm.

    In a faster reflector (f/5 or faster) they tend to show a lot of coma at the edges of the FOV. Similarly, in a fast refractor, field curvature is exhibited. In a slower scope, they put up a fine view, the 15mm especially.

    In my opinion, they make good budget eyepieces in slower scopes.

    The ES 68° series will be much better corrected for faster scopes.
    Bryan

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    Default Re: Explore Scientific 70°

    Hi
    I´ve used it for a while with F6 reflector and wasn´t satisfied. A lot of coma at the edges. I don´t have an overview of EP prices in the US but US$100 sounds like a lot for it - Mine cost around 50€

    Martin
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    Default Re: Explore Scientific 70°

    I agree with others for ~$100 it is not a good buy. It will have soft focus in your refractor and too much field curvature in your reflector.

    If you are looking for good 70-82 deg EP, I would suggest Meade 5000 UWA 14mm in addition to ES 68 and 82.
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    Default Re: Explore Scientific 70°

    Quote Originally Posted by Bigzmey View Post
    I would suggest Meade 5000 UWA 14mm in addition to ES 68 and 82.
    Also a good choice.
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    Default Re: Explore Scientific 70°

    I picked up 2 of the 25mm 70° Series a couple of years ago. This was when Explore Scientific was clearing then out at $25 each with free shipping. The ones branded as Bresser are the same as the ones that used to be branded as ES. They are Erfle design and work OK on my 11 inch SCT. They do not work well on my 8 inch reflector.
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    Default Re: Explore Scientific 70°

    Like Ozman said, these 70° eyepieces, and all of the various 70° versions of it, such as the Orion Q70 line, are best suited to refractors, SCT's and Maks. They are not an optical match with Newtonians and will show SIGNIFICANT amounts of astigmatism if used in Newt's, and how much depends on the individual focal lengths. Coma and astigmatism are different aberrations, and astigmatism is a tell-tale sign of an optical miss-match with a Newtonian. In an optically matching eyepiece and scope combo, you will ONLY see coma, and not the "seagull wings" of astigmatism. Fast refractors may also show field curvature with these as Bryan says. In the right scope these are fine eyepieces. But you need to use them in the right scope to get the best out of them.

    As for the 14mm ES 68°, I defer to the experience of others as I do not have experience with it. What I will say is to take special note of the different scopes that people use any eyepiece in, and how to what aberrations that eyepiece shows in that scope. Different EPs will perform differently in different scope designs, and there will also be variations within the different focal lengths in that line. Those ES 70° eyepieces, while not an optical match with Newt's, different focal lengths in that line will perform differently in Newt's, and some may even do quite nicely. Also depends on the f/ratio of the Newt.

    Alex.

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