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What Is Depth Of Field?

Depth of field examined from the optics up and then applied to real cinematography choices, with the emphasis on why a given film sits where it does rather than on how to achieve a blurry background.

In Depth Cine · 15 min · Intermediate · CIN · Cinematography · 2025

What you take away

Sensor size does not change depth of field on its own — it changes the focal length you need for the same frame, which is what changes the field.

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