P3D Re: Instant Anaglyphs

[Brian Reynolds <reynolds@xxxxxxxxx>]

Peter Homer wrote:
> > Brian Reynolds asked:
> 
> >Well perhaps I was unclear about one of the camera details.  I
> >intended to have both the left and the right pinhole expose the
> >same piece of film with no septum or other separating device.  The
> >image formed by the red and green pinholes should merge to form a
> >single image.
> 
> Yes but with a 60mm seperation the rays would have to travel a lot
> further than with a normal stereo camera in order for them to ovelap
> and by then they may not be in focus even with pinholes. I have
> experimented with a camera obscura with 50mm seperation pinholes and
> even at about 295 mm from holes to screen the images do not fully
> overlap yet at that distance they are already badly out of
> focus. Leonardo-Da-Vinci drew a double pinhole camera obscura with
> the pinholes offset from the centre for some reason and with no
> septum .The rays were drawn with one set falling partly on the side
> rather than back wall which would be correct because of the offset,
> and as seperate bundles which did not ovelap which is also probably
> correct . He seems to have drawn the device from life complete with
> the fault of the offset pinholes so the drawing is probably
> accurate.  You might do better to make it a reduced seperation macro
> device which a pinhole camera should be good for.
> 

This would be a problem.  Since I plan on building a camera that would
accept different lens boards it won't be a problem to play with
pinhole separations and see how this works out.

> > What if I put the red filter on the right pinhole and viewed with the
> > red filter over my left eye?
> 
> That is my thinking to and I dont se why it should not work.  The
> pinhole group you mention sounds interesting especialy there use of
> multiple pinholes is the intention here to produce stereo
> pairs.
> 

Multiple pinholes is an artistic effect.  I don't think anyone is
doing it to create stereoscopic images.  Multiple pinholes in a round
camera can produce a sort of panoramic effect.

The main reason behind this project is that both the photo-3d list and
the pinhole list have suggested self portraits recently and I thought
a stereo pinhole shelf portrait would kill two birds with one sheet of
film.  I was hoping for a method that would produce a stereo image
without further manipulation.

-- 
Brian Reynolds                  | "Humans explore the Universe with five
reynolds@xxxxxxxxx              |   senses and call the adventure science."
http://www.panix.com/~reynolds/ | - Edwin P. Hubble


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