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Out of focus objects | Virtual Cameras | Computer animation | Khan Academy

Explains how an out-of-focus point of light spreads into a circle, the circle of confusion, on the image plane, and why that circle's size determines how blurred an object looks. Connects directly to bokeh in real cinematography.

Khan Academy Labs · 2 min · Intermediate · CIN · Cinematography · 2016

What you take away

Explain why an out-of-focus point of light renders as a circle.

Watch it

Filed under

Oscar winners for cinematography

Books on cinematography

Kit for this lesson

Helios 44-2 58mm f/2 — The swirly Soviet prime — a look for the price of a meal
Canon FD 50mm f/1.4 — Warm, cheap, and everywhere — a first vintage prime
Minolta MC Rokkor 58mm f/1.4 — Glowing highlights wide open, pin-sharp stopped down
Jupiter 9 85mm f/2 — Soviet Sonnar copy — creamy, slightly soft wide open
Sony FE 16-35mm F2.8 GM II — The wide end of the same set
Canon RF 50mm F1.2 L USM — The portrait-adjacent normal

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