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Blur objects at infinity depending on camera settings - After Effects expression
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| // | |
| // This expression, applied to the blur radius of a Lens blur effect, will calc the right amount of blur | |
| // to apply to objects at infinity (eg star fields) depending on the focus dist / aperture of the current active camera | |
| // | |
| // For safety it maxes out at 100 px (!) | |
| // | |
| try { | |
| focLen = (thisComp.activeCamera.cameraOption.zoom * 102.05) / thisComp.width; | |
| blurDiam = (focLen * thisComp.activeCamera.cameraOption.aperture) / (thisComp.activeCamera.cameraOption.focusDistance - focLen); | |
| Math.min(100,Math.abs(blurDiam)/2) | |
| } catch(err) { | |
| value | |
| } |
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