Yashica CS 250 AF [25/33] Depth of field

Depth of Field

When the lens is focused on a subject, not only the subject itself, but also a certain zone in front of and behind it will turn out

sharp in the picture. This is called the depth of field of a lens and it varies as follows:

(1) The smaller the aperture, the wider the depth of field, and vice versa.

(2) The longer the subject distance, the wider the depth of field, and vice versa

(3) The zone of sharpness behind the point on which the lens is focused is wider than that in front of it. In the case of different

lenses, lenses with shorter focal lengths have a wider depth of field than those with longer focal lengths.

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The zone of sharpness can be checked on the depth-of -field scale

of the lens. If you are using a 50 mm F1.8 lens and shooting a

subject at 2 m with an aperture of F16, for the camera will turn out

sharp.

· Some zoom lenses are not provided with a depth-of-field