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  1. #11
    Phil Wheeler's Avatar
    Phil Wheeler Guest

    Default How High the Eyepiece?



    Davoud wrote:

    Well, I have a range of 44" to 52" and it could be a bit higher .. maybe
    a couple of inches more. But it works fine for visual and photo.

    But this is on a *fork*. Sorry about that

    Phil

  2. #12
    David Nakamoto's Avatar
    David Nakamoto Guest

    Default How High the Eyepiece?

    I think the real solution for the original poster is to get an adjustable
    observing seat, or even a step ladder he can sit on. (1) it would work for any
    telescope. (2) it makes for more comfortable observing, by taking the stress
    off your legs. Most observers don't seem to realize that stamina is a factor in
    long observing sessions, and standing is worse than sitting.

    Sincerely,
    --- Dave
    --
    ----------------------------------------------------------------------
    Pinprick holes in a colorless sky
    Let inspired figures of light pass by
    The Mighty Light of ten thousand suns
    Challenges infinity, and is soon gone

    david.nakamoto@verizon.net


    "Phil Wheeler" <w6tuh-ng7@yahoo.com> wrote in message
    news:OPtLf.39$h81.38@tornado.socal.rr.com...



  3. #13
    Davoud's Avatar
    Davoud Guest

    Default How High the Eyepiece?

    David Nakamoto wrote:

    I appreciate you taking time to respond, but please allow me to note --
    without malice or negative criticism intended -- that replying to a
    topic such as this one without having read all of can be problematical.

    I said in an earlier response to Phil Wheeler "I have a nice TeleVue
    Air Chair, and I will certainly factor that in my equation. The EP or
    camera is presently so low when the 'scope is close to its limit --
    observing near the meridian, on either side -- that being on the floor
    in an uncomfortable position is the only way to use the 'scope, the
    piggyback refractor, and any attached cameras. Definitely sub-optimal
    for a geezer."

    In other words, the 'scope is too low for any chair. I always observe
    while sitting on my AirChair. Add to that the fact that the 'scope is
    on a fixed mount in an observatory, and I can observe for hours on end
    without undue physical stress -- or I could before I took the 'scope
    off its fork and put it on a GEM.

    Factoring in the fact that I observe while sitting on the AirChair, it
    turns out that the pier needs to be raised by 12-14 inches. I'm going
    to install a 14" extender that can be shortened if it's too high.

    Davoud

    --
    usenet *at* davidillig dawt com

  4. #14
    Phil Wheeler's Avatar
    Phil Wheeler Guest

    Default How High the Eyepiece?

    Davoud wrote:

    Sounds like a good plan, the adjustable extender .. vs. a fixed
    addition. But I'm curious: How did the pier end up providing such a low
    position for the scope/GEM in the first place? Is it just some standard
    item which ended up not suiting your observatory configuration?

    Phil

  5. #15
    Davoud's Avatar
    Davoud Guest

    Default How High the Eyepiece?

    Davoud wrote:

    Phil Wheeler wrote:

    I'm glad you asked. I don't actually know the answer, but I'm glad you
    asked, anyway :>)

    Wait -- maybe I do know. If you look at the red-light image toward the
    bottom left of this page
    <http://www.davidillig.com/observatory14.shtml> you will see that with
    the Milburn Wedge and the Meade fork combined, the eyepiece ended up a
    considerable height above the pier. This was planned, even if I did
    rely on some guesswork. I ordered the custom-built pier according to my
    estimates, and I was right on the money, if I do say so myself. The
    eyepiece or mounted camera was nearly always comfortably within reach
    when sitting on the adjustable AirChair, and I could nearly always
    comfortably observe while standing if I wanted a break from sitting.
    (Note that the 'scope is aimed south in the photo.)

    Comes the Losmandy G11 using the same OTA. No wedge, no fork to elevate
    it. A GEM cannot swing horizon-to-horizon as a fork can. When the OTA
    is pointing roughly south on either side of the meridian the OTA is low
    on one side of the mount and the counterweight shaft is on the other
    side of the mount, nearly horizontal. (It may be either side, depending
    on what went before and what follows.) The eyepiece may be lower than
    the top of the pier if object being observed is above a certain
    declination. Big difference!

    I don't yet have a photo of the Losmandy in this position, but there
    are two drawings 3/4 of the way down this page
    <http://calgary.rasc.ca/radecl.htm> opposite the text "An Equatorial
    Mount (or 'German Equatorial Mount') is set up so that..." that show
    the position of mount with the OTA near the meridian. Imagine that
    there is an eyepice at the /bottom/ of the OTA and you will get the
    picture.

    Interestingly, GEM's are almost never photographed in anything other
    than the CWD position, OTA looking at the North Celestial Pole. I'll
    fix that when more clear weather comes along. Right now I am using
    every clear nighttime minute to observe and the daytime minutes to do
    my chores and nap so that I can use the nighttime to (insert circular
    action here.)

    I appreciate your interest and help!

    Davoud

    --
    usenet *at* davidillig dawt com

  6. #16
    Phil Wheeler's Avatar
    Phil Wheeler Guest

    Default How High the Eyepiece?

    Davoud wrote:

    I've noticed that. I guess in their more typical configurations they
    look a bit awkward .. as they are


    Oddly enough .. and I'm in So Calif, but near the ocean .. I'm getting
    lots of clear days but cloudy nights. Fortunately I have a PST; but the
    Sun has not been all that interesting the last couple of days.

    Phil

  7. #17
    WA2GUF@optonline.net's Avatar
    WA2GUF@optonline.net Guest

    Default How High the Eyepiece?


    Stephen Paul wrote:

    I explored the Losmandy site, particularly the accessories section, and
    I find
    no mention of this extension. Are you sure they still supply it?

    Clif Ashcraft


  8. #18
    Stephen Paul's Avatar
    Stephen Paul Guest

    Default How High the Eyepiece?


    <WA2GUF@optonline.net> wrote in message
    news:1140880033.614865.48020@i39g2000cwa.googlegro ups.com...

    http://www.losmandy.com/access.html

    EX12 (there's no picture) about half way down the page.



 

 
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