[Sidefx-houdini-list] aperture focal length relations

Adrian Lee dryrainstudios at gmail.com
Wed Jun 20 10:36:22 EDT 2007


yes lets hopr

thanks

On 20/06/07, Jeff Higgins <jeffrey.higgins at gmail.com> wrote:
>
> i remember someone telling me once why that was the default, but its lost
> ot
> me know.
> here's hoping one of the sesi crew will pop on and let us know!
>
> jeff
>
>
> On 6/20/07, Adrian Lee <dryrainstudios at gmail.com> wrote:
> >
> > Thanks Jeff. that does make alot more sense.
> >
> > Do you know if the default houdini settings are set for the human eye?
> > Somebody said to me that an aperture of 41.4214 is the same as the human
> > eye.
> >
> > Ed
> >
> > On 20/06/07, Jeff Higgins <jeffrey.higgins at gmail.com> wrote:
> > >
> > > i think the reason why the name is not intuitive (at least for me it
> > was)
> > > is
> > > because its often referred to it as the "film aperture", which is
> > > different
> > > from the "aperture".
> > >
> > > hopefully that makes it less confusing,
> > >
> > > jeff
> > >
> > >
> > >
> > > On 6/20/07, Jeff Higgins <jeffrey.higgins at gmail.com> wrote:
> > > >
> > > > The aperture in a real world camera is just an opening to control
> the
> > > > amount of light recieved through the lens.
> > > >
> > > > with houdini, i think the aperture is more related to the film gate
> or
> > > ccd
> > > > size, so with a larger/smaller aperture in houdini terms you would
> > > appear to
> > > > zoom in/out!
> > > >
> > > > also, its important to note that the units of your focal length must
> > be
> > > > expressed as the same units as your aperture, mixing them will give
> > bad
> > > > results. The benefit to this is that the focal length or aperture by
> > > itself
> > > > need not be expressed in a particular unit (ie. a houdini scene unit
> > or
> > > mm
> > > > ).
> > > >
> > > > hope that helps!
> > > >
> > > > jeff
> > > >
> > > >
> > > > On 6/20/07, Adrian Lee <dryrainstudios at gmail.com> wrote:
> > > > >
> > > > > Hello back again and still trying to match move Houdini's cameras.
> > > > >
> > > > > Does anyone know the relationship of aperture to the focal length
> in
> > > > > houdini? It seems to effect the zoom in the same way the focal
> > length
> > > > > does.
> > > > > this isnt true with  real world cameras. Is there a
> > > > > different  definition of
> > > > > aperture with relation to 3d?
> > > > >
> > > > > thanks in advance
> > > > >
> > > > > Ed
> > > > > _______________________________________________
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> > > > >
> > > >
> > > >
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