Animating Depth of Field

When using the camera squencer, I am unable to get the depth fo field to animate from one keyframe to the next. In other words, keyframe 1 has a depth of field of 150m, and keyrame 2 has a depth of field of 10m, but when I hit play on the preview, there is no smooth transition for the depth of field. It snaps from 150m right to 10m when keyframe 2 is hit.

Is depth fo field not supported in the sequencer?

Thanks.

If the keys are set to interpolate, it definitely should be transitioning smoothly. Double check that the keyframes are not set to constant interpolation.

AnimateFocusDistance