Polarizer

What this is about

The polarizer does something no grading suite can redo: it removes a reflection before it is ever recorded. Car interiors shot through a windscreen, shop windows, wet streets and lake surfaces are the standard jobs, and a deeper blue sky comes along for free. The catch is geometry. The effect peaks at an angle to the surface and to the sun, so a camera that pans or a car that turns changes the strength of the filter mid-take. Wide lenses can also polarise a sky unevenly, leaving a dark band across one side of the frame.

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:

• A polarizer typically costs one and a half to two stops, which has to be built into the lighting plan.
• Sky polarisation is strongest at ninety degrees to the sun and disappears when you shoot toward it or away from it.
• It barely touches reflections on bare metal, because metallic surfaces do not polarise light the same way.

With TillyGen

When TillyGen's shot list flags car and window shots, the polarizer and its light loss are in the lighting plan before the day is scheduled.

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.