Pentax MX MX Manual - Page 24

METER

COUPLING

RANGE

The

exposure

meter

of

the

MX

measures

the

brightness

of

the

ground

glass.

Therefore,

the

proper

LED

exposure

read-out

should

be

obtained

after

you

have

focused

your

subject

on

the

ground

glass.

The

green

area

in

the

table

indicates

the

coupling

range

of

the

meter,

and

should

not

be

interpreted

as

the

camera's

total

range

of

f/stop-shutter

speed

comb'nations.

As

you

will

note

from

the

table

below

with

ASA100

film,

you

may

use

any

shutter

speed

from

1

sec.

to

1/1000

sec.

in

combination

with

any

aperture

that

will

illuminate

the

green

LED

in

the

viewfinder.

The

total

range

of

the

aperture

settings

is,

of

course,

determined

by

the

minimum

and

maximum

apertures

of

the

lens

being

used.

For

example,

with

the

50mm

f/1.4

lens

and

ASA100

film,

an

aperture

from

f/1.4

(the

maximum

aperture

of

this

lens)

to

f/22

(the

minimum

aperture)

may

be

used

with

any

shutter

speed

from

1

sec.

to

1/1000

sec.

that

will

illuminate

the

green

LED.

SHUTTER

SPEED

1

1

2

1

4

1

8

1

'15

1

30

1

60

1

125

1

'250

1

500

1

1000

ASA

25

50

100

200

400

800

1,600

As

exposure

measurements

made

at

1/1000

sec.

with

25

ASA

film

will

not

be

accurate,

exercise

caution.

When

using

the

50mm

f/1.4

lens,

accurate

exposure

measurement

at

the

points

found

in

the

shaded

area

in

the

above

table

can

be

guaranteed

only

when

using

up

to

f/16

(f/1.4

f/16).

22•

Pentax MX MX Manual - Page 24

f/stop-shutter

Page 24 highlights