If the native Camera Lens Blur is too slow or you want a specific "missing" look for free: Fast Bokeh by Rowbyte
: To create a cinematic lens blur transition for free, most editors add a new Adjustment Layer , apply Camera Lens Blur , and keyframe the Blur Radius from 0 to 40 (and back to 0) at the cut point. Troubleshooting "Missing" Camera Lens Blur