Depth of Field P. 2

The circle of confusion is about how big can a spot of light caused by imperfection focus be before it's noticeable as "out of focus". It helps us understand how our camera focuses light it helps us understand what depth of field is. The iris also blocks the rays of light producing the larger circles of confusion. This affects the viewer by making them able to see the blur of a background much more clearly and it's emphasized. For a full frame 35mm sensor and half that for an APS-C sensor with 0.018mm cinematographers projecting film onto a big screen use a slightly different set of numbers. The ASC manual puts the circle of confusion of 35mm film (which is actually about the  same size of an APC-C sensor). 

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