Re: SL3D per John B

[P3D John Ohrt <johrt@xxxxxxx>]

john bercovitz writes:
> >..................
> >It is possible to put two apertures in a lens instead of one.  All
> >you have to do is take out the iris assembly and substitute a thin
> >black piece of sheet metal with two holes in it.  In fact, some
> >makers of macro cameras do this very thing.  By installing two
> >holes, you are creating two centers of perspective and that is the
> >essence of stereo photography.  Of course now your big problem is
> >how to separate or decode the two images;...............

No kidding.  Like anything at the focus forms a single image regardless
of where the apertures are!

I think it is called a Munsen(?) Mask, when you use it as a focussing
aid.... which reminds me, I'm overdue on publishing the final(?) draft
on focusing.  :-)

regards,
--
John Ohrt,  Regina, SK, Canada
johrt@xxxxxxx


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