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  1. #1
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    Question Wide angle, 26MM , 2"



    I have two EP . 9MM 1.25" and 26MM 2" wide angle.

    Now the 26MM has about 1 inch of glass to look through , Is it becuase its 2 inch or is it because its wide angle or 26 MM.

    the 9 MM has tiny hole to look.

    What I want to 9MM or 6MM power with same big glass to look through. What should I buy !!

    Once I look through 26MM I do not like that 9 MM at all even if it has more power.

    Thanks.

  2. #2
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    I think what your talking about is eye relief. That is the distance that your eye can be from the eyepiece to view, I believe it also effects the precise angle at which you can look through the EP and see objects. This creates a "tunnel" like effect. Smaller mm EP's have less eye relief. I dont really know why this is as Im fairly new to astronomy. What people do to combat the eye relief issue is to use a barlow. A 2x barlow lense will take your 26mm EP and turn it into a 13mm EP but it will maintain the eye relief.

    The wide angle is a factor of what you will see in the EP, not how large the actual piece is. A 2" EP however will have a larger piece of glass that you put your eye up to as it is a bigger eyepiece.

    There are many many posts on this subject throughout this forum and I highly recommend searching for them. They wont be hard to find in the beginners forum. Look for anything posted by Vinnie, he is the old fart with MANY MANY years of experience.
    Leith
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  4. #3
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    Exclamation barlow

    So for 2" eye piece I would need 2" barlow correct !!

    Thanks.

  5. #4
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    that is correct. Most 2" barlows will come with a 1.25" adapter so that you can use your 1.25" EP's with it as well.
    Leith
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    Lightbulb 1.25"

    But again 1.25" will have the limits on the eye relief so I will look for 2" barlow & high power 2" eye piece with good eye relief !!

    Any advise on which one to get & where !

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    Im not 100% sure on this but I dont believe that the eye relief goes hand in hand with the size of the barrel. It makes sense that a 2" eyepiece would have more eye relief than a 1.25" but I dont think that that is necessarily true in all cases.

    Im too new myself to start making recommendations on what to get, and where to get them would be highly dependent on where you live. I would suggest attending a local star party and looking through as many eye pieces as you can. Many members may even allow you to use their eye pieces in your scope so you can better determine what is best for you.
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  10. #7
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    Check out this site that gives a ton of great information on eye pieces: How to pick an eyepiece
    Leith
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  12. #8
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    Quote Originally Posted by sunny8088 View Post
    I have two EP . 9MM 1.25" and 26MM 2" wide angle.

    Now the 26MM has about 1 inch of glass to look through , Is it becuase its 2 inch or is it because its wide angle or 26 MM.

    the 9 MM has tiny hole to look.

    What I want to 9MM or 6MM power with same big glass to look through. What should I buy !!

    Once I look through 26MM I do not like that 9 MM at all even if it has more power.

    Thanks.
    From your statement here and another post of yours I think I know what your are referring to. You like the eyepieces with the large eye lenses. When observing with them they feel so immersive and not at all like squinting through a straw. Most short focal length eyepieces with big glass also have very wide apparent fields of view and are expensive.

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  14. #9
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    Yes I was exactly looking for the eye piece which you described . Large eye relief (glass to look through) & more power.

    Thank you.

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    Hi again sunny8 , check out the orion epic eyepieces . They have big glass across the barrell . It kinda looks like a window its so big . I have a 3.7mm as i bought this one when i dident know any better about too much magnifaction . But it seems the smaller the mm number the hole you look through gets smaller and smaller , like ted said "lookin through a straw" , But with the epic 2s the exit glass stays big across the field of choices . Check them out .
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