Re: [ATM] front surface mirrors for binoculars

[George Anderson <tillerman1@videotron.ca>]

Make a 2 axis gimbal mount for the FS mirror, heck even add motors to
it.

George Anderson
Montreal Canada

Clear skies and good health

Jarvis Krumbein wrote:
> 
> Hi Dave,
> 
> In the early days of space shots and satellite viewing, one of the
> techniques was to have a fairly large front surface mirror on a table
> top.  Your binoculars were mounted on a stand on the table and viewing
> down at a 45 degree angle to pick up the sky reflected by the mirror.
> This was very comfortable and you could view for hours.  A large mirror
> from a Xerox copier was often used.  I don't see why this kind of
> arrangement could not be used today.
> 
> Jarvis Krumbein
> 
> On Sat, 4 Mar 2006 14:45:54 -0800 "David Margrave"
> <david.margrave@gmail.com> writes:
> > I like binocular viewing but hate having my neck craned at abnormal
> > angles.
> > I know that one option is to get a reclining lawnchair and
> > parallelogram
> > binocular mount, but I was thinking of another scheme.  I got a
> > couple front
> > surface mirrors salvaged from overhead projectors.  I'm thinking
> > that I'll
> > make an arrangement to hold these mirrors in front of the
> > objectives,
> > rigidly at a 45 degree angle to the optical axis of the binos.  I'm
> > envisioning something that could still be mounted on a normal
> > tripod, sort
> > of like a standard bino tripod mount with another 'leg' extending
> > out
> > infront of the objectives and holding the mirrors.   I'm comfortable
> > with
> > mechanical part of this (threaded mounts, etc).  No problem, as
> > opposed to
> > the optical aspects.
> >
> > I'm wondering about the variables and how critical they are?  IF the
> > planes
> > of the two front surface mirrors are not perfectly parallel is this
> > going to
> > work?  How much can the human brain accomodate to merge separate
> > images that
> > may be slightly off-axis?  Am I going to have to painstakingly
> > ensure
> > perfect parallelism, or make provisions for having one of the
> > mirrors
> > adjustable?   It would be nice to have just one large front surface
> > mirror
> > that would span both objectives, but I haven't come across one yet.
> > I know
> > there are commercial products, but I am a  cheapskate and I'm trying
> > not to
> > spend real any money on this.
> >
> > thanks,
> >
> > dave
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> >
> 
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