Fov vs focal length 2004-06-11 - By Oscar Juárez
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Hello ill reproduce a mail from the mailing list about the FOV i hope its
what you are after.
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From: owner-xsi@(protected) [mailto:owner-xsi@(protected)]On Behalf Of
ozu's mailbot
Sent: Wednesday, May 12, 2004 4:35 AM
To: XSI@(protected)
Subject: Re: Converting XSI_FOV 2 real FOV
Actually, if you are working with XSI, you should forget about the FOV
parameter altogether, and ONLY use the FocalLength parameter
In the camera property, open the tab called "Projection Plan" and enable the
check box. set the film aperture to the values needed, and you now have a
focal length control that uses real camera values.
Remember that according to the American Cinematographer's Manual, Focal
Lengths are in mm and filmbacks are usually defined in Inches (don't ask
why, it just is, and sof follows the same convention).
While you are at it, delete the stupid camera interest, and change your
rotation order for the camera to be ZXY so that the rotation order match a
live action pivot, which is Pan,Tilt, Roll...
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Hope it helps
-- -- Original Message -- --
From: "Arvid Bj�rn" <arvid@(protected)>
To: <XSI@(protected)>
Sent: Friday, June 11, 2004 7:25 AM
Subject: Fov vs focal length
>
> Hey, I'm converting a list of shots with optics and distances to fovs
> and 3D coordinates to match camera angles.
> So I found the script belov in the archives. This was shot on Super16
> tho, so what do I need to do to make this script accurate?
> I read somewhere that the Super16 film height is 6.86mm, is that it?
>
> I'm also a little confused as to use vertical or horizontal FOV for the
> camera in XSI..?
> I'd appreciate if anyone could confirm or correct any of this info!
>
> Thanks,
> -a
> -- --by dave@(protected)
> ' script to convert 35mm lens focal lengths
> ' to Softimage F.O.V. values
>
> Option Explicit
>
> Dim VertAngle, Height, FocalLength, Pi, XSI_FOV
>
> Pi = 3.1415926535897932384626433832795
> Height = 24
> FocalLength = 50
>
> VertAngle = 2 * Atn (Height/(2 * FocalLength))
> XSI_FOV = Round(VertAngle * 180/Pi)
>
> LogMessage XSI_FOV
> -- --
>
> --
> cg/3d-artist | palladiumfilm
>
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