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  1. #1
    TheBum's Avatar
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    Default Any disadvantages to long eye relief eyepieces?



    I find it very difficult to keep lining up an object using the finder scope and then having to take my glasses off to view through the telescope. Invariably, I end up panning too far to get the object in the field of view and then have to put my glasses back on and go back to the finder scope to get realigned. I also suffer from astigmatism. Long eye relief EPs would allow me to keep my glasses on.

    Are there any significant negatives to long eye relief EPs?
    Alan
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    Joe Lalumia's Avatar
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    Default

    No- not if you keep your glasses on. In fact you should look for eyepieces with about 14mm or so eye relief even if you don't wear glasses -- just so you don't need to keep your eye right on top of the glass to see.

    and get all that eyelash oil and mascara ! Ha! on the eyepiece.

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  4. #3
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    Default

    What Joe states. That is why they make those Long ER eyepieces.
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    Default

    All of my eyepieces range from 14mm to 20mm in eye relief. I wear my glasses when observing so I actually prefer longer ER on an eyepiece.

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    TheBum's Avatar
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    Default

    Thanks guys. That's the direction I'll take then.

    Now comes the inevitable next question: What are some recommended brands/models of 1.25" long eye relief EPs without completely breaking the bank? I don't want something so cheap that it will be useless to me when I go to a better telescope (within a year, I hope), but I don't want to splurge for top of the line either. Are the Orion LER EPs pretty decent? Are there better ones close to that price range?
    Alan
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    Default

    If it just you using them, with glasses, then 'what everyone else said' applies. But note that for those who view through your scope who do not have glasses, very long focal length eyepieces can take a little bit of getting used to. Just a heads-up so you can let them know not to put their eye too close to that style of ocular.
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    , but I am getting help. Every time I look at the heavens, it helps.
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    My wife will really appreciate them too, I suspect. Her vision is worse than mine.
    Alan
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  9. #8
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    Default

    Hello TheBum,

    back to your first question. The long eye relief EP designs add one or more glass lens elements to obtain a good eye relief, and to increase the field of view. Cheap designs will eat some transmitted light, the very good designs may keep the loss at 1% or even slightly below. This costs money.

    The second issue is, for planetary observations, the so called planetary EPs are the best choice.For the DSOs, people increasingly prefer the wide field EPs with 82deg or larger. They offer a sort of space walk through the skies. The Explore Scientific EPs have become very popular because of their excellent performance-to-price ratio.

    Remeber please, once you have chosen your scope, all will depend on the quality of your EPs,

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  10. #9
    TheBum's Avatar
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    Default

    Quote Originally Posted by j.gardavsky View Post
    Remeber please, once you have chosen your scope, all will depend on the quality of your EPs,
    I fully understand. It's analogous to DSLR lenses: you buy quality lenses, expecting to move them from camera body to camera body, because they're ultimately what will separate a good image from a bad one.
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  12. #10
    Joe Lalumia's Avatar
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    Default

    To add-- also look at the Televue Radians for planetary observing (they cost more but look on the used market for lower prices). They all have 20mm of eye relief.

    I second the Explore Scientific eyepieces that j.gardavsky just mentioned.

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