Re: [tech-3d] Re: holographic 3d

[lunazzi <lunazzi@xxxxxxxxxxxxxx>]

sergio baldissara wrote:

> I have some Fresnel lenses, and Edmund Sci. sells a big choice for
> cheap... I'm tempted to do some experiments, but I don't know where
> to start from... I need some tips (drawings, calculations)... can I
> find them anywhere in the www?
>

I do not know where you can find that on the www, but you can perform the
projection on the Fresnel lens by using the largest aperture on the projecting
objective. The angular convergence of the beam exiting from the objective (not a
single lens or a doublete) to a focused image point on the Fresnel screen will
render the angular field of view for the observer.  It must be enough to allow
the two eyes of the observer within it, otherwise you do not get 3D.
I had very good results in that way. If you try by using projecting mirrors (I
believe it may render the maximum field of view), I will be glad to know about
the results.  Good mirrors can be expensive and ordinary circular mirrors
limitates the field available at the object.

José

> Sergio
> --- In tech-3d@xxxxxxxxxxx, lunazzi <lunazzi@xxxx> wrote:
> > Projecting on lenses is also interesting, it renders a floating
> image.
> > The progress in this last years shoul be in increasing the field of
> view, wether
> > using paraboloidal mirrors more specific that the Olmecas ones (as
> Peter Homer
> > indicated) or Fresnel lenses, thinner and lighter than ordinary
> glass lenses.
>

--
Prof. José J. Lunazzi
Universidade Estadual de Campinas - UNICAMP - Instituto de Física
Campinas - SP - Brazil
<lunazzi@xxxxxxxxxxxx> <http://digicron.com/lunazzi>
(os endereços lunazzi@xxxx e lunazzi@xxxxxxxxxxxx estão fora de serviço, um por
erro técnico no servidor
www.v3.com, outro por sabotagem ao servidor)