PanoTools:
Re: entrance pupil - nodal point
Dave 360texas.com 2004-Nov-12 21:29:18
Ok..
It only has an entrance and exit pupil through which ALL light must
pass before arriving at iris aperture physically located inside the
camera head at least 5 cm behind the rotation point.
In this instance, this fisheye lens is acting only as a THICK
complex LENS as the image is not inverted until it is inside the
camera head.
Image 3 This thick lens behaves according to your Higher Physics
text book definition
Image 3 http://360texas.com/images/lensangle.jpg
Dave
--- In #removed#, "Erik Krause" <#removed#>
wrote:
> On 12 Nov 2004 at 18:19, Dave 360texas.com wrote:
>
> > Image 2. The next picture is of a fisheye with no iris or
aperature
> > with groups of optics which channel the incoming light rays. It
> > appears that the image is inverted about mid center of the lens.
> >
> > I suspect that the point where the image is inverted is a nodal
> > point.
>
> No. It is the point for the best location of the iris aperture. In
> this diagram you can see very good that there is no exact nodal
> point. You find the nodal point for any viewing angle if you
lengthen
> the direction of the light rays outside the front lens to where
they
> cut the optical axis. It is easy to see that this point moves with
> the angle of view.
>
> best regards
> --
> Erik Krause
> Ressources, not only for panorama creation:
> http://www.erik-krause.de/
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