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Thread: Eyepiece question

  1. #1
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    Default Eyepiece question



    Hi all,

    Starting to look at adding an eye piece or two, and saw something that I wasn't sure about so I thought I would ask some experts

    I was reviewing the different specs etc of some eye pieces I was considering, and of course, dreaming big, I started looking at some Tele Vue pieces. (due to cost, most likely not the ones I will end up with, but like I said, a man can dream lol)

    In particular, from what I saw on the website I was looking at (Best Online Source For Telescopes in Canada - FREE Shipping - Celestron, SkyWatcher, Sky Watcher, Sky-Watcher, Meade, Orion, Televue, Kowa, Takahashi), the only real difference between a Type 4 / Type 5 Nagler is that the type 4 seems to weigh about a pound more. Is that accurate, or am I missing something?

    (links: Type 4: TeleVue - 17.0mm NAGLER TYPE 4 EYEPIECE [EN4-17.0]

    Type 5: TeleVue - 16.0mm NAGLER TYPE 5 EYEPIECE [EN5-16.0] )

    If that is correct - is there a benefit to having a heavier eye piece or is it just personal preference on the weight?
    Telescope: Sky-Watcher Esprit 80mm
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  2. #2
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    Default Re: Eyepiece question

    The type 4 has more eye relief. 17mm for the type 4, 10mm for the type5. If you need eye glasses due to astigmatism, you would go for the type 4.


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    Lola Bruce's Avatar
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    Default Re: Eyepiece question

    Al has stated that the designs could only be scaled across a certain mm range an retain their attributes so different designs for different mm's. Wide angles in high focal lengths need a lot of glass so they are large and heavy.
    Bruce
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    Default

    I have a couple of type 4s (17mm and 12mm) along with a type 6 (2.5mm).
    I also used to have one of the type 1 (4.7mm) which I didn't get along with - the eye relief was shorter than my eyelashes .
    I find the T6 quite usable (especially for that short a focal length) but I really, really like the longer eye relief of the type 4s - they're just far more comfortable to use.

    All were bought second hand, which helped bring the price down to something more affordable.

    The type 4s are more expensive than the type 5/6 equivalents - and just looking at the specs makes you wonder whether they're worth the extra. Before I got mine I think I'd have been dubious about it - but now I've used them for a while, personally I think they're well worth the extra.

    Whether that's true for other folk probably depends on how you get on with shorter eye relief eyepieces; if you're happy with the shorter eye relief then it may not be worth spending the extra - but if you prefer more eye relief, the type 4s can be worth a look.
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    Default Re: Eyepiece question

    Just to comment on your EP weight question. EPs are not designed to be of particular weight. There is no advantage of having heavier EPs, in fact most prefer lighter EPs.

    Typically, EPs with combination of wide field of view and long eye relief are the heaviest. Designers can make them lighter either by sacrificing FOV or ER, or both.

    Another consideration is that to achieve sharp and distortion-free image one need to use more glass elements. Therefore, better quality EPs are often heavier than budget ones.
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    Default Re: Eyepiece question

    Thanks Bigzmey, that makes sense, I just didn't really think about classifying any Tele Vue piece as a "budget one" no matter how little it weighs, lol
    Telescope: Sky-Watcher Esprit 80mm
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    Default Re: Eyepiece question

    Size wise, there's quite a bit of difference in the 16 T5 and the 17 T4. I use the 16 in my smaller scopes where the extra weight is unwanted. Optically, to my eyes the 17 T4 is perhaps just a bit sharper and has a bit more contrast. But this is negligible at best as both have beautiful optics. As stated, the T4's were designed to offer the largest eye relief for eyeglass wearers and are outstanding in that aspect. If eye relief is not an issue then I would probably opt for the 16 T5. I've been seeing the 16 go on the used market lately for around $225-250.

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    Default Re: Eyepiece question

    The 17mm T4 is also a 2" barrel EP vs the 1.25" of the 16mm T5. It has large lens elements (thus requiring the 2" barrel) so that it can properly correct the large light cones of fast optical systems (F5 newtonians) while maintaining excellent eye relief. For your 8" Edge with it's long focal length, this correction may not be noticeable, and the 16mm T5 would be more suitable to your needs unless eye relief is required.

    JJ
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    Default Re: Eyepiece question

    Quote Originally Posted by Hubbs1 View Post
    Thanks Bigzmey, that makes sense, I just didn't really think about classifying any Tele Vue piece as a "budget one" no matter how little it weighs, lol
    I was referring to other brands. I don't think I will ever call TeleVue "budget"

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    Default Re: Eyepiece question

    If the Tele Vues are a bit too pricey, Explore Scientific is still having their sale for a bit longer.... If you have a 2" diagonal the 30 and 18mm ES 82s would work great with your 8" Edge. Really, any of the 82* EPs from the 30mm down to the 11mm would work great with that scope, depending on your viewing needs. That big 30mm works great in my C11.
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