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    Default How do I know what eyepieces are compatible with my Scope?



    Just as the title states, how do I know what eyepieces I can use on my telescope. I see 1.25 inch and 2 inch quite common, however, I am not sure what this exactly means as we have sizes in millimeters.

    I own the Celestron NexStar 4SE and would love to buy some eyepieces, I just bought the Celestron Accessory Kit, I know this will work because it was recommended from the manufacturer, however, if I wanted a special, higher wuality eyepiece, how do I know what to get? Or for that matter, where do I buy them? For example, will a Meade eyepiece work on my Celestron telescope? And so on?

    Any help/advice is greatly appreciated. Thank you.

  2. #2
    epeddy1's Avatar
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    The diagonal that comes with your 4SE is designed to fit 1.25" eyepieces (EPs). That's the important information. Brand doesn't matter.

    However, I highly recommend trying out the EPs you have before investing in any high quality EPs. You're better of finding what you like to observe, which ones you're most comfortable with, etc. The fact that you have the kit should hold you by for long enough. Some people get by with the supplied EP for a while before buying any other EPs, so you're already ahead of the game.

    Stand pat for a while. You'll probably find that you're better off spending money on other accessories that you haven't even thought of. Moon filter, sun filter, red light, dew shield, power source, chair, books, etc, etc, etc.

    BUT, if you MUST buy an eyepiece, and have money burning a hole in your pocket, I would recommend either a good zoom EP, or a good wide angle (low power) EP, something like 32mm or larger. If you don't have a Barlow with the kit you got, that would be top priority in terms of optics IMO. I hear the Orion Shorty is a good one.
    Last edited by epeddy1; 04-13-2012 at 08:50 PM.
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  3. #3
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    Default

    The 1.25" or 2" sizes refer to the diameter of the eyepiece barrel. It is not particularly important unless you have a scope that only takes 1.25" eyepieces and want to use a 2" one. If your scope doesn't take 2" eyepieces, you can't use them.

    The more important measurement is the focal length, which is the measurement that is in millimetres. Short focal lengths give higher magnifications; long focal lengths give lower magnifications and wider views.

    Suitable focal lengths for any scope are from 1x your focal ratio to 7x your focal ratio. That is an f/13 scope, so you will want eyepieces from 13mm to 91mm. You won't find anything close to 91mm, so don't worry about the upper limit.

    You may be tempted to try eyepieces shorter than 13mm in order to achieve more magnification. In excellent seeing conditions, this might work down to about 6.5mm. Beyond that (or even before that in average conditions), more magnification will just make the view fuzzier. So, for practical purposes, 13mm is the most magnification you can use.

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  5. #4
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    Keith gives good advice above, and it just so happens that the AT 12.5mm LER is presently on sale.

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    Default

    My Celestron Accessory Kit came with a 13mm EP. So if you got the same kit as me, or if you get a 13mm in your kit, you still may want to stand pat and make sure you like the view you get from your 13mm EP before spending more money on a 12.5mm EP right away. My humble opinion.
    I'm always learning, so PLEASE correct me if I sound misinformed. I will not be offended if you tell me I'm wrong. Thanks for your patience!
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