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    Default ED eyepieces - are they better?



    I'm planning on expanding my eyepiece collection in the coming year. So far I only have 1.25'' plossls. I decided to try and expand my FOV for deep sky viewing and concluded that I need (want) one or two of Explore Scientifics 82 and 100 degree AFOV 2'' EP's, pricey though they are. Furthermore I have my eyes on the local manufacturer's ED eyepieces, 1.25'' 52 degree afov for planetary views. But are ED eyepieces any better than "achromatic" EP's (if any such term exists)?

    Perhaps I should mention that I furthermore will get a new 2'' barlow which also is described as ED.

    Clear skies, Michael

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    Default Re: ED eyepieces - are they better?

    The ED EPs I am familiar with are better than some, not as good as others. They are significantly better than the starter plossls I've seen. But not better than the premium EPs I use. However, the ones I know of are 60 degree ED EPs, not 52 degree which sounds like a plossl.

    I HIGHLY SUGGEST the ES 18mm 82 EP for ANY scope with a 2" focuser. I don't know what scope you have, so I suggest you get the ES 82s you want before you buy an ES 100 EP. You may not want to go up to 100 degrees for an EP. You really should list your equipment in your signature so we know what you are using. Upper right hand corner "SETTINGS" then lists on the left "EDIT SIGNATURE" then bottom right "Save Changes".

    I only use a Barlow for high power, usually planetary observing, so have no need for a 2" Barlow. I have one, it sits unused. Your 2" EPs will all be of a longer focal length. Barlowing one of them puts me in the range of my shorter higher power EPs, so is redundant. So I never Barlow an EP longer than my 11mm and have no need of a 2" Barlow. I would invest in a good 1.25" 2x Barlow if you don't have one.
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    Default Re: ED eyepieces - are they better?

    The term achromatic certainly is applicable to eyepieces. For instance Ramsden design (1782) is not regarded or called achromatic but Kellner design is (1849). So one usually only hears the term discussed outside the history of eyepiece designs.

    I don't like 82 degree format eyepieces so no comment on those, but whether a 2" Barlow is a good idea or not depends on the other equipment you have. I'm likely to use mine in fast Newtonian scopes (~f4) when I'm also using a coma corrector. It simplifies juggling glass in the dark which has benefits. It looks funny but works.

    Almost all wide field eyepieces have fancy ED glass of one kind or another regardless of whether they say so or not.
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    Default Re: ED eyepieces - are they better?

    Quote Originally Posted by Ozman13 View Post
    ...I HIGHLY SUGGEST the ES 18mm 82 EP for ANY scope with a 2" focuser...
    I have way more that my share of telescopes... big & little, fast & slow.

    If God stuck a gnarly finger down from heaven and decreed, "John, from this moment forward you may have only one eyepiece." I'd choose the ES 82o 18mm and never regret it for a moment.
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    Default Re: ED eyepieces - are they better?

    Quote Originally Posted by Ozman13 View Post
    I HIGHLY SUGGEST the ES 18mm 82 EP for ANY scope with a 2" focuser. I don't know what scope you have, so I suggest you get the ES 82s you want before you buy an ES 100 EP. You may not want to go up to 100 degrees for an EP.
    I'll vouch for the ES 18mm 82° EP as well - excellent EP and mine gets used a lot

    Abb
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    Default Re: ED eyepieces - are they better?

    Quote Originally Posted by Ozman13 View Post
    You really should list your equipment in your signature so we know what you are using. Upper right hand corner "SETTINGS" then lists on the left "EDIT SIGNATURE" then bottom right "Save Changes".
    You are absolutely right about that. And I should have mentioned it in the post.

    To specify, my telescope is a Bresser 6'' achromat f/7.9. My current eyepieces are the stock 26mm plossl and another 6.5 mm plossl. I mainly use the 26 with a decent 2x barlow. It's not that I don't like them, however I don't get that great view when looking at M31 eg., which is why I'm opting for a greater FOV.

    I am considering getting a binoviewer if, when I get the chance to look through one, I find it much more rewarding than viewing mono. So, maybe, I really should consider ED EP's for such an adventure (provided that I'll actually get a binoviewer)?

    And thanks for the recommendation on the ES EP. I surely would like to look through one myself, but the local club doesn't sport these, and I find that most people I know does not have these EP's either, so I appreciate your opinions and would like others as well.
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    Default Re: ED eyepieces - are they better?

    Quote Originally Posted by Lowjiber View Post
    I have way more that my share of telescopes... big & little, fast & slow.

    If God stuck a gnarly finger down from heaven and decreed, "John, from this moment forward you may have only one eyepiece." I'd choose the ES 82o 18mm and never regret it for a moment.
    I'd pick the 24mm Panoptic from TV of course......
    If allowed a set it'd be the KK Fujiyama Orthoscopics.
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    Default Re: ED eyepieces - are they better?

    Quote Originally Posted by Sputnik-Michael View Post
    To specify, my telescope is a Bresser 6'' achromat f/7.9. My current eyepieces are the stock 26mm plossl and another 6.5 mm plossl. I mainly use the 26 with a decent 2x barlow. It's not that I don't like them, however I don't get that great view when looking at M31 eg., which is why I'm opting for a greater FOV.
    That's important information. If your aim is wide views of DSOs and M31 in particular then I'd recommend the 41mm Panoptic. I find that TV eyepieces control scattered light better than the ES offerings. The 18mm ES 82 degree isn't going to get you much in terms of true field of view on M31. With the Panoptic you'd have about 2.35 degrees true field of view. With better scattered light control you'd see a darker sky background if you have access to a dark site.

    You may want to get a scope with a smaller focal length though. The views of M31 in my 80mm scope are certainly complete than with my larger instruments.

    I am considering getting a binoviewer if, when I get the chance to look through one, I find it much more rewarding than viewing mono. So, maybe, I really should consider ED EP's for such an adventure (provided that I'll actually get a binoviewer)?
    That's a completely different kettle of fish. I experimented with wide angle eyepieces and binoviewers. I have both the Baader Mark V and the Maxbright models. I had matched sets of Panoptics and Delos eyepieces. I found that with all that huge amount of glass in the optical train from the binoviewer itself and the complex eyepiece design that I was losing light. Since then I switched to using simpler eyepiece designs like Plossls and Orthoscopics for binoviewing. (In my signature you'll see I double up on Vixen NPLs and Baader BCOs.) To my taste I prefer the sharpness and light throughput. If I could get a second set of KK Fujiyama orthos at the longer end I'd do that too but have other priorities. The KK Orthos are better in terms of contrast, scattered light control and throughput. But since binoviewers tend to need barlows or glass path correctors the short focal length end of things is not all that useful.

    And thanks for the recommendation on the ES EP. I surely would like to look through one myself, but the local club doesn't sport these, and I find that most people I know does not have these EP's either, so I appreciate your opinions and would like others as well.
    I have some of the ES100 set for really wide field views. They're very nice for that. But there is scattered light and not so dark a sky at the same magnifications as my Panoptics, Plossls, and Orthoscopics.
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    Default Re: ED eyepieces - are they better?

    I have the 9mm (2") and 4.7mm(1.25") ES. The 9 weighs in at about 2# (as I recall - it is much heavier than any other lens I own). When I use my alt/az mount I have to add counterweights to the scope to offset the 9mm - when within about 20 degrees of the horizon. I *love* both of these lenses - especially since they are nitrogen purged and don't frost up. I prefer 2" lenses. But maybe I'm weird. No, I am weird.

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    Default Re: ED eyepieces - are they better?

    Quote Originally Posted by Star Dad View Post
    I have the 9mm (2") and 4.7mm(1.25") ES. The 9 weighs in at about 2# (as I recall - it is much heavier than any other lens I own). When I use my alt/az mount I have to add counterweights to the scope to offset the 9mm - when within about 20 degrees of the horizon. I *love* both of these lenses - especially since they are nitrogen purged and don't frost up. I prefer 2" lenses. But maybe I'm weird. No, I am weird.
    Weird is good.

    I have a set of ankle weights that I attach to the tube of the Z12 with magnets when I am using the ES100s I have. They are pretty massive...
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