Defocus / Blur transition
Watch as an animation →Focus goes soft, then comes back sharp in a different scene, expressing a dream, a flashback or a shift in point of view.
Waking-up scenes, flashbacks, soft changes of location.
At the end of A put "focus slowly pulls to full blur", and at the start of B put "starts fully out of focus, focus pulls in". Support it in the edit with xfade=transition=hblur.
Two-shot sequence: Shot 1, a girl sits at a window with a cup of tea, ending as the focus slowly pulls to full blur into soft golden bokeh, 3 seconds; Shot 2 starts fully out of focus on a warm childhood bedroom, then the focus pulls in on a young girl drawing on the floor, 3 seconds. Dreamy and soft.
StudioBinder — Types of Editing Transitions (Defocus section)