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  1. #1
    Matalog's Avatar
    Matalog Guest

    Default Eyepiece Question



    I bought some Antares Eepieces (32mm & 6mm Plossl and a 14mm W70). I used
    to have some cheap huygen eyepieces that came with my telescope (Tasco
    Luminova 40114675). When I looked through my telescope with the old
    eyepieces and I could see something in focus and moved my head to the side
    or up or down (perpendicular to the direction the telescope is pointing) I
    could still see the image, but with my new eyepieces if I move even a tiny
    bit the image disappears, blacked out, I have to be very still looking down
    the centre of the eyepiece.

    Is this common, is there any way to change it, and if I had have bought a
    higher quality eyepiece, would I still have the same problem?


    Thanks for any help.



  2. #2
    Doink's Avatar
    Doink Guest

    Default Eyepiece Question

    That's eye relief. The better eyepieces, in this case are less forgiving of
    where you place your eye. Also, you SHOULD notice a sharper view with your
    new eyepieces. With that "telescope" you can forget the 6mm eyepiece. I
    would doubt much success beyond 12mm. Make sure the eyepiece is seated in
    all the way.

    Prepare for many nights of frustration until you eventually give up on the
    hobby or buy something good. You'll need to get in by about $350 minimum and
    probably closer to $500 to really enjoy the hobby. Unless you're 4 feet
    tall, skip the 6" Dob and go straight to an 8" reflector on a good EQ
    mount---preferably with tracking drives---not goto! Or look for a 4-5"
    short tube refractor on a good mount...(visit telescope.com and
    astromart.com) And finally, cut up your credit careds.

    Doink


    "Matalog" <matalog@ntlworld.com> wrote in message
    news:Xyq0g.35881$8o.24379@newsfe6-win.ntli.net...



  3. #3
    Phil Wheeler's Avatar
    Phil Wheeler Guest

    Default Eyepiece Question

    Doink wrote:

    Well, not always "better". Long eye relief also means more elements.
    Some of the best planetary EPs are simpler ones (UO Orthos and HD
    orthos; RKEs) which have short eye relief but fewer elements.

    Of course, it is a trade: I need the long ER so it is hard for me to use
    the simpler EPs.

    Phil

  4. #4
    Doink's Avatar
    Doink Guest

    Default Eyepiece Question

    Hi Phil,

    That's what I said...the better eyepieces, in this case are less forgiving.
    (Those Hyugens have eyerelief but are crap) There are other better eyepieces
    with longer eyerelief. UO eyepieces have little eyerelief but are some of
    the sharpest EPs around.

    Doink

    "Phil Wheeler" <w6tuh-ng7@yahoo.com> wrote in message
    news:jht0g.2591$WA3.322@tornado.socal.rr.com...



  5. #5
    Matalog's Avatar
    Matalog Guest

    Default Eyepiece Question


    "Doink" <skyman102a@aol.com> wrote in message
    news:BqednYmkp9GGw9_ZnZ2dnUVZ_tGdnZ2d@trueband.net ...



    of
    your

    The view is sharper and wider than before.



    You seem to doubt that my telescope is worthy of being called a telescope,
    it's a 4" reflector on an equatorial mount, not much different from any 4"
    reflector I would say, given that there's not much to them, 2 mirrors, a
    focus wheel and a tube basically.

    The telescope has a focal length of 900mm and a Aperture of 114mm (4 inches)
    Highest usage of magnification should be aperture (in inches) times 50:
    4*50=200.

    To determine power, divide the focal length by the focal length of the
    eyepiece (mm): 900/6=150 , so it should provide acceptable results, at least
    in theory. It does, on a good night.

    I

    It was in the full way.





    Every night is frustrating for me, I live in Ireland and hardly see the sky
    because of cloud cover (so buying a more expensive scope may prove to be
    even more frustrating, I may never get to use it). Nights that I do see the
    sky I generally come out happy, but of course, a bigger aperture could only
    result in a happier nights sky watching.


    .. You'll need to get in by about $350 minimum and
    used
    side
    I
    tiny
    a



  6. #6
    Phil Wheeler's Avatar
    Phil Wheeler Guest

    Default Eyepiece Question

    Matalog wrote:


    That's a typical Doinkism. If it works OK for you, it is a telescope.

    Phil

  7. #7
    Doink's Avatar
    Doink Guest

    Default Eyepiece Question

    It's practicality. The guy expresses frustration with the views then posts
    what a great instrument his 4" Tasco is. OK, great. Enjoy. The views at
    200X will be beathtaking---especially with the plastic hyugen eyepiece
    supplied. Even in Ireland.

    Doink


    "Phil Wheeler" <w6tuh-ng7@yahoo.com> wrote in message
    news:55x0g.3096$WA3.2738@tornado.socal.rr.com...



  8. #8
    Matalog's Avatar
    Matalog Guest

    Default Eyepiece Question


    "Doink" <skyman102a@aol.com> wrote in message
    news:iIGdnRSIBYh1P9_ZnZ2dnUVZ_tqdnZ2d@trueband.net ...

    Being an astronomer you should understand that a telescope is a telescope, I
    was expressing frustration at your calling my telescope a "Telescope", which
    suggests that you don't class it as a real telescope, when I was asking
    about my eyepieces. It's a different matter when you suggest that I upgrade
    my scope without deriding it.


    then posts


    I didn't say my telescope was a great instrument, just that I am happy with
    it and it is as good as most other 4" reflectors. The question I asked was
    about the problem I had with my eyepieces, not my telescope.




    telescope



  9. #9
    Doink's Avatar
    Doink Guest

    Default Eyepiece Question

    Sorry to offend you. I'm also sorry it is not as good as most other 4"
    reflectors---it's a Tasco, it just isn't. But it's yours so have a ball. I
    do think you could have used the money you spent on the eyepieces and the
    original investment in your "telescope" and you would have had something
    much better...But it's not my business. But, MOST, if not all of the
    problem with viewing is going to be in your telescope. Another problem,
    regardless of how great the optics are on your $100 Tasco, the mount will be
    shakin' worse than the French at the start of WW1 and 2! At 200x you won't
    be able to breathe near it...

    My only point is---don't give up. Look on astromart or telescope.com before
    you give up.

    Doink


    "Matalog" <matalog@ntlworld.com> wrote in message
    news:QIy0g.36313$Ph2.27434@newsfe4-gui.ntli.net...



  10. #10
    Joe S.'s Avatar
    Joe S. Guest

    Default Eyepiece Question


    "Matalog" <matalog@ntlworld.com> wrote in message
    news:Xyq0g.35881$8o.24379@newsfe6-win.ntli.net...

    Matalog:

    I will apologize to you for the immature comments by the individual signing
    the name "D____."

    You asked a reasonable question and he immediately and, apparently,
    purposefully went far afield, never answered the question, then started
    commenting on your telescope.

    Your replies to him were measured and gentlemanly -- which is a lot more
    than I can say for him.

    Not all us Yanks are like him, although we do have our share of assholes --
    some of them on the Usenet, some of them in the White House. Please don't
    judge the rest of us by these few.



 

 
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