User manual

ManualsBrandsMinolta ManualsDigital CamerasXG-9

36

Depth

of

field

The

distance behind

and

in

front

of

the

focused distance within which

the

image ap-

pears acceptably sharp

is

called

the

depth

of

field.

It

extends

a greater distance

behind

the

focused distance

than

in

front

and

is

deter

-

mined by

three

factors

:

the

aperture

size,

the

distance

at

which

the

lens

is

focused, and

the

focal length

of

the

lens

in

use. Depth

of

field

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increases as

the

lens

is

stopped

down

(e.g.,

f/2

to

f/16)

and

becomes greater

the

farther

from

the

camera

the

lens

is

focused. I t decreases

as

the

lens

is

opened

up (e.g.

f/16

to

f/2) and the

closer

to

the

camera

the

lens

is

focused. Depth

of

field

is

greater

for

short

focal length lenses

than

for

telephoto

's

at

the

same focused dis-

tance

and

aperture.

It

is

at

its least

for

any

given lens

in

normal

mounting

when the lens

is

at

maximum

aperture

(as when metering and

focusing normally with Minolta

MD

-

or

Me

-

type

lenses)

and

at

minimum focusing

distance.

Depth

-

of

-field preview

Depth

of

field

at

any aperture and focusing

distance can

be

previewed visually by pushi

ng

the

stop-down

button

all

the

way in. This will

stop

the

diaphragm

down

to

the

aperture

corresponding

to

the

f-number preset on

the

aperture

ring, allowing

you

to

see through the

viewfinder

how

much

of

the

subject

is

accepta-

bly sharp.