Pentax Spotmatic Spotmatic Manual - Page 17

Range

of

light

measurement

The

exposure

meter

of

the

Spotma-

tic

measures

the

brightness

of

the

ground

glass.

Therefore,

the

meter

should

be

turned

on

after

you

have

focused

your

subject

on

the

ground

glass.

The

following

table

shows

the

range

of

the

meter's

light

measure-

ment,

and

should

not

be

interpret-

ed

as

the

camera's

total

range

of

f/stop-shutter

speed

combinations.

As

you

will

note

from

the

table

be-

low,

with

an

ASA100

film,

you

may

use

any

shutter

speed

from

1

sec.

to

1/1000

sec.

in

combination

with

any

aperture

that

will

bring

the

meter

needle

to

the

midpoint

in

the

viewfinder.

The

total

range

of

the

aperture

settings

is,

of

course,

de-

termined

by

the

minimum

and

max-

imum

apertures

of

the

lens

being

used.

For

example,

with

the

50mm

f/1.4

lens

and

ASA100

film,

an

aper-

ture

from

f/1.4

(the

maximum

aper-

ture

of

this

lens)

to

f/16

(the

mini-

mum

aperture)

may

be

used

with

any

shutter

speed

from

1

sec.

to

1/1000

sec.

that

will

bring

the

meter

needle

to

midpoint.

ASA

B

1

1

2

1

4

1

8

1

15

1

30

1

60

1

125

1

250

1

500

1

1000

20

•

(25)

32

•

(40)

.

•

(50)

64

•

(80)

100

•

(125)

•

(160)

200

•

(250)

•

(320)

400

•

(500)

•

(640)

800

•

(1000)

-

(1250)

_

1600

The

area

A

indicates

the

eading

range

of

he

meter.

The

a

ea

B

indicates

that

although

the

shutter

speed

index

is

black

and

the

meter

needle

moves,

the

meter

is

NOT

operating

properly.

When

the

meter

needle

is

centered

with

the

shutter

speed

dud

set

al

Busing

ASA

20-50

films,

this

indicates

that

the

exact

shutter

speed

required

is

2

seconds.

Please

expose

your

pidure

for

2

seconds

15

Pentax Spotmatic Spotmatic Manual - Page 17

Range, light, measurement

Page 17 highlights