Focal Length

What this is about

Focal length is a storytelling decision before it is a technical one. Director and DP assign millimeters per shot: a 24mm keeps a character inside their environment, an 85mm lifts them out of it. The number also drives logistics — long lenses need distance the location must offer, wide lenses pull lamps, flags and crew into frame and force deeper set dressing. That is why shot lists carry a lens column: focal length fixes the camera position and tells every department how much of the space will be seen.

A term only helps when everyone on set means the same thing by it — so what follows is how it is used, not a dictionary definition.

What runs differently here

Where this differs from the general case:

• Focal length describes the lens alone — the same 50mm frames noticeably tighter on Super 35 than on full frame.
• Perspective compression comes from camera distance, not from the glass; the long lens only crops a narrower view.
• As a rough rule, faces keep their natural proportions from about 50mm upward on Super 35.

With TillyGen

In TillyGen's shot list every shot carries a lens column, so focal lengths are decided before the first setup is built.

Change one constraint and the consequences travel through the whole plan: affected shots are flagged, the call sheet is regenerated, and nobody keeps working from yesterday's version.