Pentax K-X User Manual download pdf (Page 91)

Shooting Functions

Opening the aperture (reduce the aperture value)

Objects closer and farther than the focused

subject will be more out of focus. For

instance, if you take a picture of a flower

against a landscape with the aperture open,

the landscape in front and behind the flower

will be blurred, emphasizing only the flower.

Closing the aperture (increase the aperture value)

The range in focus expands forward and

backward. For instance, if you take a picture

of a flower against a landscape with the

aperture narrowed, the landscape in front

and behind the flower will be in focus.

Aperture and Depth of Field

The following table summarizes how the aperture affects the depth of

field.

The depth of field may also change depending on the lens used and

the distance to the subject.

• The depth of field for the a differs depending on the lens but

compared to a 35 mm camera, the value is roughly one aperture

setting lower (the focused range becomes narrower).

• The wider the wide-angle lens, and the farther away the subject,

the deeper the depth of field is (some zoom lenses do not have a

scale for depth of field because of their designs).

Aperture

Open Close

(Smaller value) (Larger value)

Depth of field Shallow Deep

Area of focus Narrow Wide

Lens focal length

Longer Shorter

(Telephoto) (Wide-angle)

Distance to the subject Near Far

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Pentax K-X User Manual Page 91