PanoTools:
Re: entrance pupil - nodal point
Erik Krause 2004-Nov-11 01:08:41
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/
------------------------ Yahoo! Groups Sponsor --------------------~-->
Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
Now with Pop-Up Blocker. Get it for free!
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/.Cr1lB/TM
--------------------------------------------------------------------~->
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/PanoTools/
<*> To unsubscribe from this group, send an email to:
#removed#
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/