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Thread: 5mm Eyepiece

  1. #1
    GirlAloneWithHerself's Avatar
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    Default 5mm Eyepiece



    OK, this post is probably where I reveal myself to be the complete and utter idiot that I am.

    When I first got into star-gazing, I went a little nuts and bought a few accessories for my scope. The first thing I bought was a light filter, which has been amazing! Enamored with my success, I bought a 5mm eyepiece. However, unlike my light filter, I have not had much success with this eye piece at all.

    I can't seem to see anything through it, no matter what I try. I've tried focusing in on something with my 20mm, then my 10mm before switching to my 5mm, but there is absolutely nothing showing.

    Any tips? I'm beginning to think I've wasted money on this eyepiece.

    Girl.
    Telescope: Celestron Cosmos FirstScope.
    Lenses: 5mm, 10mm, 20mm.

  2. #2
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    Default Re: 5mm Eyepiece

    What 5mm eyepiece is it? The main problem may be just your eye here or the position of your eye at the eyepiece. When you get down to this level of focal length especially with plossls (I assume it is one of these), you also get very low eye relief meaning you have to get your eyeball darn near to the actual glass for it to work and perhaps even then your eye.

    Have you tried this eyepiece with the Moon? What did you see? Was is just bright / out of focus? Or the view was black?

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  3. #3
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    Default Re: 5mm Eyepiece

    Hey Girl.,,that ep is too much power for that scope.,,so it will be a pain to try to get it to focus.,,plus when trying to focus with that much power the "window of FOCUS" is very small.,it is either focused or it is fuzzy.,,no sorta almost there.,,I hope this is clear.,sell it or put it in the sock drawer till you get a bigger scope.,or try it in the day time..see if it will focus on something far away.,good luck.,,O+O
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    Default Re: 5mm Eyepiece

    I don't agree that the eyepiece is too much power for that scope. It would be too much for many scopes, but yours is an f/4, so a 5mm eyepiece should be just fine. I think Davesellars has the right idea about eye relief. If it is a Plossl type eyepiece, you'd have to have your eyeball practically touching the lens to see anything.
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    Default Re: 5mm Eyepiece

    I didn't quite finish my sentence oops. I also meant to say that once you get your eyeball close enough to the glass even then perhaps your eye may not be suited to such a short focal length.

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    Default Re: 5mm Eyepiece

    Your scope is not being overpowered by the 5mm eyepiece, assuming it is a plossl you have 59x mag with a .9 degree TFOV. I would suspect it is the very short eye relief in the range of 2-3mm that may be the problem. If you have a barlow try using that with your 10mm and see if it helps.
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  7. #7
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    Default Re: 5mm Eyepiece

    Well.,,the numbers say you should be able to use a 5mmEP in that scope.,but I bet my money that in the field.,that combo (scope+EP) would be more frustrating than fun.,YMMV.,,O+O.

  8. #8
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    Default Re: 5mm Eyepiece

    I agree it could be the eye-relief: you have to get too close to see through it- a classical plossl eyepiece of 5mm focal length will give you only about 5mm eye-relief.
    If that is you on your avatar you are wearing glasses. This means that you need in the order of 12mm of eye-relief (minimum) in order to see through an eyepieces- and even then your glasses would be touching it and pushing onto your nose!
    Try looking without glasses and see if you can see anything.
    If you need glasses to get a sharp image (if for example you have astigmatism) then you will need an eyepiece with a good eye-relief, like the Long Perng series (see Andrews Communications ) or the Zhumell (Zhumell Z Series Planetary Telescope Eyepieces - Telescopes at Telescopes ). (As far as I know these are identical to the much more expensive Orion "edge-on" and the Williams "planetary".)
    These have 20mm eye-relief and give very good views.

    All the best,

    Dean
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    Default Re: 5mm Eyepiece

    In addition to what others already said. Short focal length EPs like 5mm tend to give blackouts: due to very narrow holes they typically have you eye needs to look perfectly straight, otherwise the image will go black. I remember it was really annoying when I just started, but then it becomes a second nature.

  10. #10
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    Default Re: 5mm Eyepiece

    A problem I have noticed with EP's that have limited eye relief is that during cool or cold conditions, the proximity of the warm humid eyeball so close to the eye lens, causes fogging. If the EP fogs it will be impossible to seem to focus. Try keeping the EP warm before use by holding it in a gloved hand or keep it in a coat pocket close to the body. When away from the scope remove it and keep it warm.

    JJ
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