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Thread: Plossl question

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    Default Plossl question



    I'd like to know if there are viewing situations where there is an advantage to using a Plossl EP over others with a wider FOV such as a Nagler or Ethos.
    Mike

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    Default Re: Plossl question

    From a FOV perspective, some folks like a smaller "frame" around their image, especially planets.

    From a quality perspective, Plossl and Nagler/Ethos don't belong in the same sentence.
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    Default Re: Plossl question

    Thanks! My question was related to quality of view.
    Mike

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    Default Re: Plossl question

    I believe a narrower field of view can also help obscure bright stars when trying to detect faint objects that are near to them. I believe the horsehead nebula might be an instance but it's not something I can see with my scope anyway! Maybe there are other instances where bright stars need obscuring?? Also price! I have a non goto scope so a wide FOV at higher magnification means I don't have to nudge the scope as much, which leads me away from Plossls. If I had a goto I think I'd have to ask if the 'spacewalk' effect of looking through the wider FOVs really mattered all that much.
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    Default Re: Plossl question

    Your point about obscuring bright stars is a good one; hadn't thought of that. My first scopes were non goto and have been in the habit of using wider FOV for the reason you mention. I now also have go to capability. That, along with comments I've picked up in the forum, have made me think about the use of Plossls.
    Mike

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    Default Re: Plossl question

    It's not exactly a Plossl but that's why I'm keeping my Explore Scientific 24mm 68° eyepiece: good exit pupil on my F6 scope and "narrowish" FOV to obscure bright objects near fainter ones. Read this article on the ideal eyepiece for the horsehead nebula and while not relevant to my scope (just doesn't gather enough light) the idea made sense: Magic Eyepiece
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    Default Re: Plossl question

    Thanks for the article. Really useful information I was not aware of.
    Mike

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    Default Re: Plossl question

    Hello Mconcino,

    in lots of cases people keep in their arsenal a mix of the ultrawide eyepieces with some small FOV orthos or even Plössls. The orthos and Plössls have a minimum of the lens elements, and therefore they offer very bright and contrasty views if compared with most of the ultrawide EPs, which stack larger numbers and 'thicker' lenses.

    Best,

    JG
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    Default Re: Plossl question

    Hi Mike. I have Plossl eyepieces from 4mm (GSO) to 40mm (Orion). My personal view over 20 years of observing, is that the 4 element symmetrical eyepieces really deliver the goods between the 20mm and 40mm focal lengths. This is a good thing, as the modern telescope manufacturers can now deliver quality telescopes with an included quality (25mm) eyepiece to enhance their product's optics, over the 2 and 3 element junk eyepieces that were supplied with the telescopes in past years. I often recommend that some new observers get a 32mm Plossl to compliment their eyepiece collection. Although the APOV is the same (at 52*) as the other Plossls, with the lower magnification, your TFOV increases. And, you have a "wall to wall" glass to look through. This is as good as it gets, until you are ready to spend more money on a 70* to 82* 1.25" eyepiece, or even a 2" eyepiece. I have two 32mm 1.25" Plossl eyepieces. One is an older A. Jaegers (1975) military surplus eyepiece with a single coating, and one is an Orion (2010) eyepiece with multi coatings, and I am holding on to them both. I love the crisp high contrast views that they can deliver. I hope this helps Mike, and best of regards.
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    Default Re: Plossl question

    Re: Plossl Question

    Hi mconcino

    No one seems to have reminded you of the wealth of information in the ''Sticky'' posts for EPs.
    I have acquired some five pairs of mid-price plossels for use with a bino-viewer.
    "Purchase Plain Plossels in Pairs"...
    A wide angle EP or a 2 inch EP may not be useable or suitable for future bino-viewer use...
    Also each additional 'layer' of glass in the EP design subtracts more light... as per JG...

    Best Wishes
    JFD
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