Suppose we focus a simple single-lens (focal length f, diameter D) camera at infinity. We then point the camera at a point object at distance s (not at infinity). What is the diameter of the out-of-focus disk on the sensor?

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Suppose we focus a simple single-lens (focal length f, diameter D) camera at infinity. We then point the camera at a point object at distance s (not at infinity). What is the diameter of the out-of-focus disk on the sensor?

 

Thin lens, focal length f, diameter D
Light forms an out-of-focus
disk on sensor
Point object, closer
than infinity, distance s
Camera sensor, pixel size p
positioned so that an object at
infinity is in focus
to the lens
Transcribed Image Text:Thin lens, focal length f, diameter D Light forms an out-of-focus disk on sensor Point object, closer than infinity, distance s Camera sensor, pixel size p positioned so that an object at infinity is in focus to the lens
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