The image point F^(**) corresponds to an object point O^(**) on the axis at a finite distance L from the lens. Using the results in example 3, show that this hyperfocal distance L depends only on the aperture diameter d and wavelength λ:
L = (d^(2))/(2)λ
The points located on the optical axis in object space from infinity O to point O^(**) appear sharp at the focal plane. The space between O and O^(**) is called the depth of field. For a fixed focus camera to maximize depth of field, the detector is usually positioned at some distance from the focal point F^('). What distance is it?
The image point F* corresponds to an object point O* on the axis at a finite distance L from the lens. Using the results in example 3, show that this hyperfocal distance L depends only on the aperture diameter d and wavelength:
L = d^(2)/2
The points located on the optical axis in object space from infinity O to point O* appear sharp at the focal plane. The space between O and O* is called the depth of field. For a fixed focus camera to maximize depth of field, the detector is usually positioned at some distance from the focal point F'. What distance is it?
r cos
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0
O
L
F
x