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must

be

swung

forward

as far as

it

will go,

Figure

J

7.

The

SHUTTER

RELEASE

is

then

pushed

down;

the

shutter

will

open

and

remain

open

until

the

TIME

EXPOSURE

LEVER

is

swung

back

to

its original

position.

LENS

OPENINGS

The

lens openings .

regulate

the

amount

of

light

passing

through

the

lens.

These

openings

are

enlarged

or

reduced

by

moving

the

lever C, see

page

12.

A knowledge of

the

comparative

values

of

the

lens openings is

necessa!'y for correctly

timing

exposures.

The

lens openings

are

marked

j /3'5,

4,

5.6, 8,

II,

16,22,

and

32.

The

largest lens

opening

is

j/3.5.

This

opening

allows

approximately

thirty

per

cent

more

light

to

enter

thanj/4.

Fromj/4

toj/32

each

smaller

open-

ing

(larger

number)

ad

.mits

half

the

light

of

the

preceding

larger

lens opening.

Thus,

if

the

correct

exposure

is

1/100 second

atj

/

8,

then

the

exposure

for

j /5.6 should

be

1/200 second; for j /

4,

1/400

second;

for 1/1 I, 1/50 second,

and

for 1/

16,

1/

25

second.

The

exposure for

the

average

outdoor

subject,

when

the

sun

is

shining,

is

j /8

and

1/100 second

with

Kodak

Verichrome

or

Plus-X

Panchromatic

Film. The important thing

to

remember

is

the

average

23