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is there a focalLength property in AE?
For various reasons it’d be useful to be able to determine the field of view of a given camera, which (I think) you can get with this formula –
FoV = 2 * Math.atan(film_back / (2 * focal_length))
where film_back is the filmback in mm (usually 36 in AE) and focal_length is 35mm, 50mm, etc. I can’t seem to find a focalLength property anywhere though – does it exist?
Cheers
Nick
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2 Replies
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The Zoom property can be used for this.
I use this expression for horizontal fov:
FoV = Math.atan((thisComp.width/2) / thisComp.activeCamera.cameraOption.zoom)*2;radiansToDegrees(FoV);
use thisComp.height to get the vertical angle.
A little known fact:
the “zoom” of a camera is equal to the distance in Z-space a comp-sized 3d layer has to be from the cam in order to fill the screen. -
that’s very very helpful. Thanks Filip! Didn’t know the zoom fact either, which will help too. 🙂
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