Exposure

What this is about

Exposure belongs to the DP, and on a professional set it is measured, not guessed. Log footage looks flat and dull on any monitor, so eyeballing the picture is unreliable; the DIT reads a waveform, the operator watches false color, and an incident meter still settles arguments quickly. The working stop stays locked for the look, which means exposure gets moved with ND filters and lamps rather than with the iris.

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

In planning terms, that means:

• A flat log image on the monitor says almost nothing about exposure; only a scope or a meter gives a number.
• Shutter angle is usually parked at 180 degrees for natural motion, so it rarely serves as an exposure control.
• The camera report should record stop, ISO, ND and white balance per setup — post reads it later.
• Skin tone placement is the practical reference point; charts and grey cards only calibrate the tools around it.

With TillyGen

In TillyGen the working stop and ISO ride along with each lighting setup, so the exposure decision is written down before call time.

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.