Re: [photo-3d] Hyper active

["John A. Rupkalvis" <stereoscope@xxxxxxxxxxxxx>]

Yes, and I believe similar instruments are currently manufactured by a
company in Italy (I forget the name).  If I recall, they are marketing it to
architects for evaluation of existing buildings before modifications or
additions are made to them.

JR

----- Original Message -----
From: "Brian Reynolds" <reynolds@xxxxxxxxx>
To: <photo-3d@xxxxxxxxxxx>
Sent: Monday, October 23, 2000 11:57 AM
Subject: Re: [photo-3d] Hyper active


> John A. Rupkalvis wrote:
> > With the hyperstereo viewing device, it is the two inboard mirrors
> > that are spaced such that their optical centerlines are about 65mm
> > apart.  The outboard mirrors are spaced much further apart, the
> > optical centerline distance determining the hyperstereo base.
> > Otherwise, the configuration is the same as that of a camera image
> > splitter.
> >
> > The results when looking at the images as seen through the center
> > pair of mirrors can be quite fascinating.  This is especially true
> > with wider stereo bases and more distant subjects, because when
> > something is so far away that there is little depth perception with
> > the unaided eyes, it is possible to make the depth impression quite
> > exaggerated, which in some cases is quite startling.
> >
>
> During WWII German artillery spotters used a device that could match
> that description for ranging artillery shots.  From the outside it
> looks like a long tube with binocular eyepieces at the middle on one
> side and lenses on each end on the other side.  I don't know if they
> used mirrors or prisms to bend the optical path.  My military
> modelling books are all in storage so I also can't tell you the
> official name of this device.
>
> The various other armies also had similar devices.  The British
> version is called a Coincident Optical Rangefinder, and Barr & Stroud
> are credited with make the first practical ones in 1888.
>
> --
> Brian Reynolds                  | "Dee Dee!  Don't touch that button!"
> reynolds@xxxxxxxxx              | "Oooh!"
> http://www.panix.com/~reynolds  |    -- Dexter and Dee Dee
> NAR# 54438                      |       "Dexter's Laboratory"
>
>
>
>