[MF3D.FORUM:1632] Re: Using front shift to simulate camera movements?

["Bill Glickman" <bglick@xxxxxxxx>]

Matt,

> Two cameras can be mounted facing each other on an adjustable rail -- with
a
> small front-surface mirror mounted at a 45 degree angle in front of each
lens.
> This allows you to get both cameras quite close (limited by the size of
the
> mirrors), and allows easy access to the focusing and film advance
mechanisms.
> Matt

        Thanks for the suggestion Matt.  Have you ever tried this before?
How is the results?  I would assume the mirors would introduce some
sharpness loss?   Also, how do you determine your interocular distances?  Is
it the measurement between the center of the mirors?

         This may be difficult since I am using range finders vs. SLR.

Bill G


>
> Bill Glickman wrote:
>
> >       I am trying to develop a MF camera system that allows one to set
> > interocular bases at any seperation without physical limitations.....As
we
> > all know, this is physcially impossible sometimes with two non- shift
> > cameras.  My idea was to use two cameras side by side, but each one
would
> > have the capability to shift the lens horizontally.   This has a very
> > dramatic effect vs. spacing the cameras.  For example, I can simulate
24"
> > interocular distance with only 3mm of front shift on one camera.  I have
> > tested this, it works.  So a small amount of lens shift would simulate
> > interocular spacing fro 0 to 500 + ft.
> >
> >       I have found that myself and my audience all prefer very small
OFD's,
> > say 1.3mm, hence the need for bases much tigher than any two cameras can
> > every physically acheive.   A fixed stereo camera (sputnicks) don't
appeal
> > to me because I want the flexibility of adjusting the interocular
distance
> > when required.
> >
> >         Although this sounds good in theory, I am curious if this will
> > produce the same stereo effect as utilizing two cameras at the proper
> > interocular distance.  I don't plan to use it for excessive bases, only
for
> > 24" and less.  Has anyone every tried this before?  Any input?
> >
> > Bill G
>
> --
> ______ Matthew V. Ellsworth ______________________________
>       oakridge@xxxxxxxxxxxxx      http://www.oak-ridge.com
>