Nikon 2SB Photomic Buku Petunjuk - Halaman 19

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DEPTH OF FIELD

Depth of

field

refers

the

zone of acceptable focus ex-

tending

front of, and

behind,

the

plane

of sharpest

focus.

Within

this zone,

image

blur

negligible and

everything may

considered as being in sharp focus.

Three

factors greatly

influence the depth

of field

the

focal

length

of the

lens

use,

the camera-to-subject

distance, and the taking aperture. The smaller the aper-

ture and the shorter the focal

length

of the

lens,

the

greater the depth of field. Also, the closer the subject,

the shallower the depth of field.

These

three factors can

operate independently

or in conjunction

with

one an-

other, with anyone factor capable of partially cancel ing

the effects of the other. Thus, by careful selection and

use,

the

photographer

can exercise wide creative control

over the final

picture.

Depth-of-Field Preview Button

As most Nikkor lenses

are operated at full aperture for

ease of focusing, visualization of the

depth

of field at the

shooting aperture

may be difficult. Thus, the camera's

depth-of-field preview button

often can come

in handy.

The

depth-of-field

preview button lets

you check (or

"preview")

the

zone of

sharpness

at any

time before (or

after) shooting.

Simply by depressing the button,

the

lens is

stopped

down to

the

preselected

aperture to allow

you

see

how much background

and foreground

is in

or out of focus.