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Thread: Mirror based eyepieces ?

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    Default Mirror based eyepieces ?



    I was just thinking - We have both lens based (refractor) telescopes and mirror based ones (newtonians, cassegrains, etc). But I've never, ever, seen a mirror based eyepiece. I wonder if there's an optical reason for this?

    (and I'm having a hard time visualising what a mirror based eyepiece would look like... maybe something like a tiny reversed newtonian with you looking down what would normally be the input end on a normal newt ?)
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    Default Re: Mirror based eyepieces ?

    So.... another cloudy night eh?
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    Default Re: Mirror based eyepieces ?

    Hmmm. By your description, I envision an itty bitty cassegrain type device.

    I couldn't imagine trying to collimate that.
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    Default Re: Mirror based eyepieces ?

    I think the "eyepiece" would still be a tiny Newtonian
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    Default Re: Mirror based eyepieces ?

    Quote Originally Posted by Cosmos63 View Post
    Hmmm. By your description, I envision an itty bitty cassegrain type device.

    I couldn't imagine trying to collimate that.
    teeny tiny little bobs knobs, tiny geared down tweezers and a microscope?

    maybe if we add a bit of glass you could have a fixed collimation micro-mak .
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    Default Re: Mirror based eyepieces ?

    Quote Originally Posted by Gabby76 View Post
    I think the "eyepiece" would still be a tiny Newtonian
    But would it work? I wonder if someone could try it with a big dob as the scope and a small newt - though the exit pupil might be a bit big...
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    Default Re: Mirror based eyepieces ?

    Quote Originally Posted by jerryTheC View Post
    But would it work? I wonder if someone could try it with a big dob as the scope and a small newt - though the exit pupil might be a bit big...
    I now see a gigantic focuser with knobs as big as a ships wheel.
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    Default Re: Mirror based eyepieces ?

    Quote Originally Posted by Cosmos63 View Post
    I now see a gigantic focuser with knobs as big as a ships wheel.


    That reminds me of the mainframe mouse.

    77.png
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    Default Re: Mirror based eyepieces ?

    I've managed to find one example (sort of). It has several mirrors in it, anyway, along with beamsplitters and some lenses...

    The Lunar Excursion Module infinity display used in the LEM Simulator to provide the view outside the triangular main window.
    110 Degree AFOV, 1 foot eye relief, and a 1 foot exit pupil - so you could look with both eyes and move your head around.

    Designed by Al Nagler when he was working for Farrand Optical Co before he went on to launch Televue. (I had the privilege of meeting Al when he was over giving a talk at Astrofest in the UK a few years back. Great guy!). Should have remembered this sooner - it was in the talk .
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    Default Re: Mirror based eyepieces ?

    ... a 2mm aperture Schiefspiegler Newtonian mounted on the focuser.
    Don't ask me about the observing comfort, please.

    Another cloudy night rolling here,

    JG
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