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  1. #1
    lissyssil's Avatar
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    Default Plossl vs. Super Plossl?



    Hey all, new user here, (you can see my intro post in the appropriate forum) and I have a simple question for you.

    I recently purchased a 4.5 Newtonian off Kijiji (It's a Bushnell 78-4501), and have read a few reviews that say that the kit eyepieces (20mm and 4mm) are really bad, and that I should replace them with Plossls. I'm not opposed to doing so, as they pieces I'm looking at are about $40, but first, a question:

    What's the difference between a Plossl and a Super Plossl?

    Thanks,
    Mark.

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    Default

    Hi Mark ..Welcome aboard ..Congrats on getting your scope .. No difference really in the design ..Just some companys call them super hoping to sell more i guess ...
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    Default

    And some of those "kits" ARE plossl style eyepieces. The plossl is still considered to be an "improved" eyepiece design....... especially as compared to what we had before they showed up.

    They make good very usable eyepieces especially on slower telescopes.
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    In 1860 Georg Plossl announced his design consisting of two doublets. The quality for the time was significantly better than what had gone before. But it had a few short commings. Several modifications followed.

    The primary limitation with the Plossl today is the aFOV is about 50 degrees and the eye relief is limited to about 70% of the fl. The eye relief especially is a problem for a short fl.

    There are several mods today that use the terms super plossl or super view which are a basic plossl design but changed a bit to achieve better eye relief and typically a wider aFOV. This has been made possible since lenses can be machine ground instead of doing it by hand. Hand grinding had limited prescriptions and each lens added a lot of cost.

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    Default



    Hi,
    To me plossl means plossl as in the inventors name
    and it works!!
    Super plossl is the term used for sales!

    And sales depends on the customer!

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    Default

    Unfortunately, the name "Plossl" has become associated with a number of designs and it can be difficult to tell just what you are getting.

    At one time, I understand, Meade Super Plossls really were an improved design. Now their "Super Plossls" are Plossls which are the better ones from their manufacturer but are just Plossl in design.

    To find a Super Plossl you should count on going to Agena Astro and get a look at their GSO Superviews. They are the Super Plossl of our day and are typically (I believe) a 5-element Modified Erfle design. OPT Corp sells the same Superviews under their own brand name.

    There are others selling the same GSO Super Plossls under various names and and packaging. Generally what I think when I run into an eyepiece with 68-70 degree AFOV and a 5-element design I figure it is probably a Super Plossl and it was probably made by GSO.

    FWIW from a non-expert.

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  11. #7
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    Default

    Hello Mark,

    Plössl EP has got a symmetric design of two small achromats,

    Eyepieces

    Super Plössls add as a rule one more lens to increase the eye relief, and to increase the field of view.

    Plössls (and Super Plössls) are excellent choice for small telescopes, beacuse of their very high transmissivity and contrast.

    Best

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    Default

    Thanks all for the replies. Looks like I'm off this afternoon to pick up an eyepiece. Now, if only we could get rid of this cloud cover!



    Cheers,
    Mark

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    Default

    Well, that was awesome! Went to a local shop (Focus Scientific in Ottawa) this afternoon, and picked up a used Antares 12.5 Plossl for twenty bucks. Should be a big improvement over both my Huygens 20 and Symmetric Ramsden 4 that came with the kit.

    Now, CLEAR SKIES, please!

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    Yes, that should be a significant improvement - and it looks to me like you got a very good price!

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