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Thread: Eye Pieces & Plossl/Super Plossl

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    Default Eye Pieces & Plossl/Super Plossl



    Hello Friends,
    So now I have a scope that can reach out there and suck down a respectable amount of light (Zhumell Z8 8" Dobsonian). This scope came with a 9 mm and 25 mm 1.25" eyepiece and a 26 mm 2.00" eyepiece. The stated focal length is 1200 mm.
    I was wondering about the focal properties and equations relating to eyepieces as well as the optical benefits of these $400.00 Super Plossl eyepieces I see advertised in the magazines.
    Thank you in advance. James
    Last edited by AnonymousRider; 01-26-2013 at 04:11 PM.

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    Default Re: Eye Pieces & Plossl/Super Plossl

    Hi AR,

    There is plenty of good info in the eyepiece section of the wiki.

    With your current eyepieces you have exit pupils of 1.5 mm, which is good for planets, planetaries, binaries and remote faint fuzzies, and 4.3 mm which is nice for DSOs, but your scope could handle a longer FL EP. A 32 mm would give you a 5.4 mm exit pupil and some great views of extended nebulae, or maybe if your bank manager allows it you could get something a bit longer in the 2" barrel range like a 40 mm which would give you a wonderful rich field 6.7 mm exit pupil. If your wallet is still flush then you might look at something down the lower end to bring out details of planets and binaries on nights of good seeing. A 6 or 7 mm would be an option, but in the plossl range these EPs would have very poor eye relief, so you might look for something more expensive to provide comfortable viewing.

    Kind regards,
    Euan
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    Default Re: Eye Pieces & Plossl/Super Plossl

    Thank you, Euan. I will research your suggestions today. James

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    Default Re: Eye Pieces & Plossl/Super Plossl

    As mentioned by Euan, visiting the Eyepieces forum (specifically the stickies in that forum) will help.

    As you mention $400 "Super Plossls" that are advertised "in the magazines", I suspect you might have a bit of an incorrect definition of the term "Plossl". The term "Plossl" and "Super Plossl" refer to the lens arrangement in the eyepiece. Some other examples of lens arrangements are Monocentric, Orthoscopic, Konig, Kellner, Huygens, and Erfle. For a long time, I'd say up until the mid 1980s or so, most eyepieces were sold with one of these lens configurations, and the manufacturer's "secret sauce" became other features like coating quality. So you might be able to get a Monocentric eyepiece from Edmund Scientific, or a Monocentric eyepiece from TMB. Both would have the same lens configuration, but TMB might use more exotic glasses or better coatings to improve the view.

    Eventually, though, companies like Televue, Baader Hyperion, and even Chinese/Taiwanese firms like Synta and Guang Sheng Optical (GSO) found that the technology was within reach to design exclusive eyepieces with unique lens arrangements that weren't like any of the "classic" designs noted above. These eyepieces began being sold under a company-specific brand name, for example the Baader Hyperion, the Explore Scientific 68degree series, or the Televue Nagler. These eyepiece designs are light years ahead of older, simpler designs. For example, a Plossl is comprised of four lens elements in two groups. The lenses are symmetrical, making them relatively easy to manufacture, and the lensing properties are favorable for astronomical observation (good edge correction in slow scopes and a respectable 55 degrees AFOV). Compare this to something like a Televue Ethos, which has 12 or more lens elements, all completely unique (and many using exotic high dispersion glass). The Ethos is definitely not a "Super Plossl". It delivers edge-to-edge sharpness across a massive 100 degree apparent field, even in relatively fast telescopes: something only an exceedingly complex eyepiece design can do. Check out this article for a peek inside: Explore Scientific 14mm Ethos 13mm English

    As you are shopping for eyepieces, I suggest you read an overview I wrote recently regarding how to choose the best eyepiece:

    Choosing the right eyepieces

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    Euan Mason (01-26-2013),flytyer (01-27-2013),olddogg60 (01-26-2013)

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    Default Re: Eye Pieces & Plossl/Super Plossl

    I never saw anything special IN THE ONE super plossl I ever owned ( a Meade) to distinguish it from a regular plossl ... So I never even bothered to buy another...

    If you like and want plossls and have money to burn go first class and get a regular plossl from any name brand maker...
    If you want a larger FOV then go shopping for a 68-70 degree Eyepiece ..(mid price range in you scope )
    If you want a much larger FOV go shopping for an 82 degree eyepiece ...

    Bob G.
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    Default Re: Eye Pieces & Plossl/Super Plossl

    The original Meade series 4000 smooth sided Super plossl made in Japan was a 5 element design(Super) But over time it went to the 4 element design with the rubber eye cup we know today. Really nothing super about them anymore but the old smooth side 5 element design is highly sought out. I have a few and really like them. Im trying to put together a full set. I have a few of the 4 element made in Japan type and they are ok.
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    Default Re: Eye Pieces & Plossl/Super Plossl

    So many choices - I remember being like this when I was 6 years old and given a quarter to go to the local store to by candy (back then 25 cents went a long way). Fast forward to 2013 and instead of bubble gum it is EPs. What a trade off....
    billy

    32° N 83° W


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