Re: Camera Tilt

[P3D Michael Kersenbrock <michaelk@xxxxxxxxxxx>]

> > RE: Dr. T et al maybe should have said horizontal tilt on straight
> > stereo cameras may not result in vertical misalignment. ........
> 
> All this talk and it seems so simple to me.  What happens when you tilt your
> head?  Tilting a camera should do the same thing.  Or does the list need a
> chiropractor? :-)

What you say is truer than you think.  If you tilt the horizon with
the camera and then tilt your head when you view it (which you'll
tend to do) then it'll seem "okay".  Except, as you say, you need
a chiropractor while viewing slides. Especially if tilts are random from
slide to slide.

I've taken some with 90-degree tilt in my old beamsplitter experimentation
days, and if you look at the results in a viewer with your head sideways, 
it looks "okay" -- but it's somewhat awkward to do.  :-)
So except for that "slight" problem, one can use the extreme aspect
ratio of a beamsplit slide in the "other" configuration.

With projection, it'd be a bit harder to tilt the projector with your
head. If the image is tilted 20-degrees, you'd want your head tilted
20 degrees, *and* the image as taken aligned with your eyes so that
the image will be what your eyes would see in real-life with the
head tilted 20-degrees.  With a viewer, that happens when you tilt
your head and viewer together.  Wouldn't work with projection in
a practical sense -- projector would need a chiropractor too.  

Sounds complicated when written.   Taking a few photos with big tilts
of the horizon is a fun and easy experiment to do, and everybody should
at least try it a time or two just for the fun of it.  Despite warnings
that dark deadly things will happen if you do.  Just don't take them
to your club for projection.  :-)

Mike K.


------------------------------