Photography knowledge! ! What does depth of field mean?

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entrance guard

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Did this guy say the depth of field backwards? The greater the depth of field, the greater the clear range (referring to the depth in the direction pointed by the lens).

The depth of field is divided into two parts: 1, foreground, and the distance from the focal point in the lens direction to the nearest clear point.

2. Backshot, the distance from the focus to the farthest clear point in the direction away from the lens.

The larger the aperture (the smaller the aperture number), the greater the depth of field. There is a depth of field ring on the lens. You can check it.

The principle of pinhole imaging can be considered, which is similar. Combining the principle of convex lens imaging and the requirement of image clarity, the range of depth of field can be calculated.

It's complicated I calculated it myself. Very fulfilling.