Praktina FX - img008

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Diaphl'a

.gm

adjusting

ring

It is employing the diaphragm

that

puts

life

into

photography.

A

perfect

command

of

the

use

of

the

diaphral\'m will

help

to

deve

op

all

the

possibilities

of

ex·

posure

technique.

The

ground

,glass

clearly

shows

that

there

are

certain

limits

to

the

sharpness

of

the

image

before

and

behind

the

focusing

line.

This

may

suffice

for

qU

1

ite

a

number

of

photographic

tasks.

As

a

rule,

however,

the

perspect

live

of

the

selected

moti.fs will

reach

a

long

distance

into

spa

ce, i. e.

the

depth,

thus

requir-

ing

a

w~der

distrihution

of

the

sharp

area.

This

depth

of

sharpness

ill

ohtained

by

set-

ting

the

diaphragm.

Rave

a

look

into

the

front

of

your

camera

lens

and

turn

the

milled

diaphragm

ring.

With

the

diaphTagm

at

full

aperture,

you

have

,

the

milllimum

depth

of

field, as

it

is

originally

produced

by

the

optical

sY

5

tem.

On

the

other

hand,

if

yo,? close

down

the

diaphragm

,as

far

as

4.