[Sidefx-houdini-list] aperture focal length relations

Jeff Higgins jeffrey.higgins at gmail.com
Wed Jun 20 08:37:50 EDT 2007

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!


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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