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    Re: Lunar Distances with Alex's SNO-T
    From: Alexandre Eremenko
    Date: 2006 Nov 1, 23:27 -0500

    Frankly I never understood well
    your talks about "refocusing"
    eye or telescope.
    What does it mean?
    There is only one "focused" state of the
    telescope eye system.
    It is in this state IC and other measurements
    have to be taken. When the image is
    maximally sharp.
    On Wed, 1 Nov 2006, Bill wrote:
    > Alex wrote
    > > Can you suggest a testing range
    > > in Greater Lafayette area where we can perform
    > > Frabk's laser testing. (I will buy a laser level
    > > for this purpose). We need a 500 feet flat place
    > > with a table on one side and no people walking.
    > I looked up Frank's initial post. It strikes me what we are measuring is the
    > distance between the center of the scope and the reflected image on the
    > first pass.
    > Then we are moving away to see that the distance remains the same (beams are
    > parallel).
    > In that post he states, "Poor telescope optics might  present a problem."  I
    > remain convinced, at least with my scope and any I have tested, as well as
    > the observations of others on the list, that changing the focus can affect
    > side error and IE.  So if we focus the scope for the smallest dot, we can
    > only check IE at that focus point.  Yes?  So it might not remain the same
    > once we refocus for our eyes?
    > Bill
    > >
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