Depth of Field Myths: Does Focal Length & Sensor Size Affect DoF?

Depth of Field Myths: Does Focal Length & Sensor Size Affect DoF?

Discussing various factors that affect depth of field including focal length, sensor size, f-stop, & distance to subject and debunking common DoF myths.
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Video on Entrance Pupils & f-stops:
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From Wikipedia:
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In optics, the phenomenon known as depth of field (DOF) is the distance about the plane of focus where objects appear acceptably sharp in an image. Although an optical imaging system can precisely focus on only one plane at a time, the decrease in sharpness is gradual on each side so that within the DOF the unsharpness is imperceptible under normal viewing conditions.

In some cases, it may be desirable to have the entire image sharp, and a large DOF is appropriate. In other cases, a small DOF may be more effective, emphasizing the subject while de-emphasizing the foreground and background. In cinematography, a large DOF is often called deep focus, and a small DOF is often called shallow focus.

Precise focus is possible in only one two-dimensional plane; in that plane, a point object will produce a point image. In any other plane, a point object is defocused, and will produce a blur spot shaped like the aperture of the lens viewing it. When this circular spot is sufficiently small, it is indistinguishable from a point, and appears to be in focus and is considered “acceptably sharp”. The diameter of the circle increases with distance from the plane of focus; the largest circle that is indistinguishable from a point is known as the acceptable circle of confusion. The increase of the circle diameter with defocus is gradual, so the limits of depth of field are not hard boundaries between sharp and unsharp.

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#depthoffield #bokeh #sensor

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