Re: "real" cameras in xsi

["Marc Bourbonnais" <marc(at)hybride.com>]

It's an outdated measurement, from the TV tubes era, where the effective 
view size diagonal was about 2/3 of the view value. So 2/3" * 0.666 = 
0.444", about 11mm. That's for a 2/3" CCD of 4:3 ratio, 8.8mm x 4.95mm.

It's roughly the same with 1/2", 1/3", 1/4" etc... CCDs. Just multiply by 
2/3 and you'll get -again roughly- the real diagonal aperture.

Awful stuff, but that's what we get paid for.

--
Marc Bourbonnais
3D TD
Hybride
(450)227-4245
----- Original Message ----- 
From: "Andi Farhall" <andi(at)clearpost.co.uk>
To: <XSI(at)Softimage.COM>
Sent: Wednesday, January 25, 2006 12:27 PM
Subject: RE: "real" cameras in xsi


> I always get confused with the way ccd size is expressed as imperial.
> How is 2 thirds of an inch 9.59mm? I made it 16.93mm. Is the ccd
> measured diagonally?
>
> -----Original Message-----
> From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf
> Of Francois Lord
> Sent: Wednesday, January 25, 2006 5:12 PM
> To: XSI(at)Softimage.COM
> Subject: Re: "real" cameras in xsi
>
> Most HD cameras have a filmback of 2/3" (9.59mm wide). You could try
> that.
>
>
> Gene Crucean wrote:
>
> > Holy thread revival batman!
> >
> > I'm still a little confused by this stuff (I know I know). So in
> > boujou, it wants the film back size (which I don't have, but I know it
>
> > was shot on a Sony HDW-5900H), and the focal length which is 3'2". I
> > tried searching on the web for the film back size of that camera but
> > no information for that camera even comes up at all. So I guess my
> > first real question is does anyone know the FB size of that camera?
> > The only information that we have on the camera is the lens (7m which
> > I'm assuming is a typo meant to be mm), the foc which is 3'2" and the
> > PSF which is 23.98. Well and some other random info like height, tilt,
>
> > Tstop, roll etc.
> >
> > I ran a quick track on it without using the correct FB info and no
> > surprise it comes into xsi with a FOV of something like 12 (way off
> > visually). I'm a little confused with all this conversion stuff so any
>
> > input would be appreciated.
> >
> > Thanks guys
> >
> >
> >
> >
> >
> > On 6/15/05, *Robert Moodie* <robertm(at)hybride.com
> > <mailto:robertm(at)hybride.com>> wrote:
> >
> >     While we're on the subject - here's a little something:
> >
> >     Run this (vbs) script:
> >
> >     NewScene
> >     SelectObj "Camera_Root", "BRANCH"
> >     ToggleVisibility
> >     DeleteObj "Camera_Interest"
> >     SelectObj "Camera"
> >     Rotate , 0, 0, 0, siAbsolute, siPivot, siObj, siX, , , , , , , , 0
> >     GetPrim "Null"
> >     GetPrim "Null"
> >     Translate , 0, 0, -20, siAbsolute, siPivot, siObj, siZ, , , , , ,
> >     , , , , 0
> >
> >     Now, hide the grid in the camera view and in any other view - NOT
> >     THE CAMERA VIEW - select and rotate (pan) the camera.
> >     Watch what happens to the nulls - there is no parallax.
> >
> >     Now run this:
> >
> >     SetValue "Camera.kine.local.pposz", 1.5
> >
> >     (What we are doing is offsetting the camera pivot to be 'behind'
> >     the lens - to see the pivots turn them on in Visibility options)
> >
> >     Now select and pan the camera as you did before and watch the
> >     magic of parallax.
> >
> >     This is no limitation of XSI - it happens in all 3D apps - but
> >     basicaly the pivot point of 3D cameras is also the Nodal point.
> >     And this never happens in real life.
> >
> >     For further explanation read this:
> >     http://360texas.com/tips/nodalpts.htm
> >     <http://360texas.com/tips/nodalpts.htm>
> >
> >     Hopefully this may be a little help to someone. If you know the
> >     make and models of your 'real' cameras, tripods or dollies you can
> >     set the pivot offset values to match exactly what was on set.
> >
> >     _rob
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > --
> > -gc
>
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