Focus Pull / Rack Focus

What is it?

A focus pull (or rack focus) is shifting the camera's focus from one subject to another within a single shot — the foreground blurs as the background sharpens, or vice versa. Nothing moves except attention: it's the camera saying "now look at this" without a cut.

Practical example

The shot opens on a coffee cup in crisp foreground focus, the person behind it a soft blur — then the focus glides: the cup melts into blur as the person's face sharpens, just as they start to speak. One shot, two subjects, a built-in reveal. Filmmakers use it constantly for narrative redirection; in production settings it appears in product shows ("from the host's face... to the device in their hand"), music performance close-ups, and any moment where attention should travel without the punctuation of a cut.

Key things to know (non-technical)

• It only exists where depth of field is shallow — if everything is in focus at once (the default of phone cameras), there's nothing to pull between.
• It's a deliberate, performed move: real productions literally employ a "focus puller" whose whole craft is landing these shifts.
• Modern phones fake it convincingly: portrait/cinematic modes compute the blur and can even shift the "focus" between faces automatically — software impersonating a focus puller.
• For live work it's a flourish, not a staple — but a single well-placed rack focus instantly reads as cinematic.

In Tupic Live

Where supported by the phone's cinematic-mode capabilities, a tap-to-rack-focus in Tupic Live's camera (tap the product, the host blurs; tap the host, focus glides back) would hand creators one of cinema's signature attention tools — particularly potent for the product-demo and live-shopping formats where "look at this object" is the whole game.