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  1. #1
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    Default What makes GSO so Super?



    I've been doing a little research into the 25mm and 10mm Super Plossl EPs that come with a 8" Skywatcher scope (that I'm 95% sure are these GSOs), and I can't figure out what the difference is between these and standard Plossls. They are 4 element, and not 5 element like the eyepieces that are often described as Super Plossls.

    Is there any difference between the GSO Super Plossl and a stardard Plossl, or are they super only in the minds of their creators?
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    Default

    I'm not sure, but I doubt there is. Below is a cool diagram of various eyepieces. I doesn't mention the dif. between regular and SUPER , but it's cool to look at.

    http://members.shaw.ca/quadibloc/science/opt04.htm
    name: Derek

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    Default

    Hi Dave,
    I have the Super Plossls or SuperView GSO (wide-views).

    I am very happy with them for less than $35-40 including tax. I am not a super visual viewer, but out of a few different types and models of eyepieces (usually cheap ones) I find them very good as they have a wide-field and are great value for the money.

    Plus they are made in Taiwan not China
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    Default

    OK, here's what I have found, combined with a modicum of speculation.

    Plossl EPs have a FOV of about 50 degrees and consist of 4 elements in 2 groups.

    Super plossls are essentially Erfles, with 5 elements in 3 groups, and have a FOV of 60 degrees or so.
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    We have been broadcasting our presence to the Universe for 100 years now. If there is a detachment of Galactic Pest Control within 100 light years, they are already on the way.

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    Default

    Hi Dave ...There is no such thing as a "super plossl" ...Plossl is a design of elements Some manufacturer decided to put super in front of plossl ...I have read that plossl designs have a rather narrow field but i prefer them ..Mabey because i havent really used a real wide field EP ...Check this out .. Eyepiece - Wikipedia, the free encyclopedia
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    classic Big-mac , Meade eye pieces with a few odd balls thrown in ...
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    Default

    Quote Originally Posted by WWPierre View Post
    OK, here's what I have found, combined with a modicum of speculation.

    Plossl EPs have a FOV of about 50 degrees and consist of 4 elements in 2 groups.

    Super plossls are essentially Erfles, with 5 elements in 3 groups, and have a FOV of 60 degrees or so.
    That's what I've gathered too Pierre, some claiming the original Super Plossls are a design called a Masuyama. There's a thread on CN, showing the common 52 degree AFOV using 5 elements in 3 groups, much like the Erfle.

    The GSO ones though appear to be standard Plossls, they have two doublets spaced very closely.

    I'm kind of leaning towards the Super Plossls just being regular Plossls with a fancier name.
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  12. #7
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    Default

    Quote Originally Posted by roverich View Post
    Hi Dave ...There is no such thing as a "super plossl" ...Plossl is a design of elements Some manufacturer decided to put super in front of plossl ...I have read that plossl designs have a rather narrow field but i prefer them ..Mabey because i havent really used a real wide field EP ...Check this out .. Eyepiece - Wikipedia, the free encyclopedia
    I think it depends, Rich. The Plossls have pretty wide FOVs compared to eyepieces that were used years ago. Definitely better the the Ramsden and Huygens EPs that come with cheap scopes. They're just narrow compared to the new wide field EPs that have been coming out.
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    Default

    Practically all the "Plossls" being sold today are not the true Plossls - a 4-element eyepiece designed by Gustav Simon Plossl in the 1860's. See (p.30):

    http://www.brayebrookobservatory.org...fEYEPIECES.pdf

    Most "plossls" today are of the symmetrical type (two identical doublets) because they are easier and cheaper to manufacture and mass-produce so I wouldn't put too much weight (if any at all) on semantic embellishments like prefixing it with the word "Super" which hardly means anything in the context of the scheme of these things.

    Best,

    Hernando

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    Default

    Why not TRY a regular plossl and the GSO Superview side by side? in the same focal length.
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    Default

    Quote Originally Posted by Joe Lalumia View Post
    Why not TRY a regular plossl and the GSO Superview side by side? in the same focal length.
    I don't have one, unfortunately. The closest I have is a 9mm Celestron and 10mm Super Plossl. I'm not talking about the Superview's though, those are 68 degree AFOV. I'm talking about the 52 degree "Super Plossls" like this one. They look and seem to be standard Plossls (or the symmetrical Plossls, as ibase correctly pointed out), I was just wondering if there are actual design differences between these and standard Plossls, or if the Super is an adjective only.
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