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## Pixar in a Box

### Unit 6: Lesson 2

Mathematics of depth of field

# Circle of confusion calculation

## Problem

Below is a diagram for calculating the radius of a circle of confusion, B, C. E represents the center of the lens and D represents the top of the aperture. A is where the rays from a particular point intersect. F, G is a line passing through A that is perpendicular to the image plane and to the lens.
Click and drag the angles below to match angles of the same size.
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