PanoTools:
Re: entrance pupil - nodal point and Entrance Pupil location
Dave 360texas.com 2004-Nov-11 01:55:06
My next question is what is the definition of "Nodal Point" and
definition of "forward lens Entrance Pupil location" ? After
learning each definition, then we can compare the physical locations.
Please work with me on these issues.
--- In #removed#, "Dave 360texas.com"
<#removed#> wrote:
>
> BTW.:
> Quote "There is not only one aperture inside each lens. There are
> several designed to minimize stray light. Any of them could be the
> one limiting the diameter of the pencil of rays if you don't stop
> down. Would this mean that the "no parallaxe point" moves if I stop
> down?" /Quote
>
> I agree there is only 1 aperature device inside each lens.
Because
> it it a mechanical device that permits the camera owner to dial in
> the F-Numbered like F-11, 16, 8 etc. Dialing in the F-stop number
> allows the depth of field to be changed. Hence the Circle of
> Confusion factor to come into play.
>
> Dave @360Texas.com
>
>
> --- In #removed#, "Erik Krause" <#removed#>
> wrote:
> > On 10 Nov 2004 at 22:52, John Houghton wrote:
> >
> > > > On 10 Nov 2004 at 8:59, John Houghton wrote:
> > > > Sorry, but from optical geometry this can not be true. You
> don't
> > > > change refraction by putting an aperture somewhere, hence
you
> can not
> > > > modify the location of nodal point with this technique.
> > >
> > > I did say that this did not change the position of the nodal
> point.
> > > It is nevertheless the case that if you experimentally
determine
> > > the "no parallax" point, it corresponds to the position of the
> > > aperture, not the nodal point. Try it yourself.
> >
> > I'll do it, but first off all please tell me the exact settings
> you
> > used. And please could you explain the theory why the "no
> parallaxe"
> > point should corresponds to the position of the aperture? This
is
> > contradictory to all I learned about geometrical optics and what
> > proved to be true all the time...
> >
> > BTW.: There is not only one aperture inside each lens. There are
> > several designed to minimize stray light. Any of them could be
the
> > one limiting the diameter of the pencil of rays if you don't
stop
> > down. Would this mean that the "no parallaxe point" moves if I
> stop
> > down?
> >
> > best regards
> > --
> > Erik Krause
> > Ressources, not only for panorama creation:
> > http://www.erik-krause.de/
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