• Adobe After Effects Expressions

  Apertute from distance

  Posted by Christian Buettner on September 30, 2008 at 7:49 pm

  Hey guys …

  thanks Dan for that great autofocus expression. What would I need to type in to link the aperture to object distance? let´s say the camera is quite far away from an object, so I would need to raise aperture levels to blur out the image. but when I track the camera closer, I need a lower value for aperture, so that I don´t blur my bg to hell.

  thanks a lot for all your help

  Christian

  Dan Ebberts replied 17 years, 7 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Dan Ebberts

  September 30, 2008 at 10:00 pm

  Seems like you cold tie aperture to focus distance with an expression like this:

  focusDist = cameraOption.focusDistance;
  minAp = 20; //minimum aperture
  maxAp = 200; //maximum aperture
  fMinAp = 1000; //focus distance for min aperture
  fMaxAp = 100; //focus distance for max aperture
  linear(focusDist,fMaxAp,fMinAp,maxAp,minAp)

  Dan

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