Construct · 1 fields · 2 citations

circle of confusion: a standalone construct

One name. One construct. A landmark on the map.

● anchor · one construct, one field Nearest construct by meaning·not indexed
circle ofconfusion1 CONSTRUCTCircle of confusionDEPTH OF FIELD

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Optics & photography

The largest blur spot still seen as a sharp point

In optics and photography, the circle of confusion is the blur spot that an out-of-focus point source projects onto the image plane: a point is perceived as acceptably sharp as long as its blur circle stays below a chosen diameter, a threshold tied to the final viewing distance and the eye's acuity. Jenkins and White's Fundamentals of optics and Ray's Applied photographic optics treat it. This acceptable limit is what defines depth of field and the hyperfocal distance, since those follow from how far a point can be defocused before its blur circle exceeds the threshold.[1][2]

Unit
The diameter of the acceptable blur spot on the image plane
Recovery means
Not applicable
Measured by
Set as a tolerance (e.g. a fraction of the frame diagonal) and compared to the geometric blur-spot diameter produced by defocus

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Nearby constructs

hyperfocal distance1 fields · 1 citationsanchor · one construct, one fieldconfusion3 fields · 3 citationsjingle · one word, three constructsdepth of field1 fields · 1 citationsanchor · a single standalone construct

References

  1. Ray, S. F. (2002). Applied photographic optics (3rd ed.). Focal Press. ISBN 9780240515403
  2. Jenkins, F. A., & White, H. E. (1976). Fundamentals of optics (4th ed.). McGraw-Hill. ISBN 9780070323308

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