[Sidefx-houdini-list] aperture focal length relations

Jeff Higgins jeffrey.higgins at gmail.com
Wed Jun 20 09:15:58 EDT 2007


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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