Pentax SF-1 SF-1 Manual - Page 50

TTL

AUTO

FLASH

AND

PROGRAMMED

AUTO

FLASH

MODES

TTL

Auto

Flash

Mode

For

Programmed

AE

and

Shutter

-Priority

AE

Modes

•

Like

the

built-in

RTF

unit,

the

AF400FTZ,

which

is

designed

exclusively

for

use

with

this

camera,

auto-

matically

adjusts

the

shutter

speed

and

aperture

according

to

the

subject's

brightness,

making

it

easy

to

accomplish

even

complicated

daylight

flash

synchronization.

(See

the

operating

manual

of

the

AF400FTZ

for

more

detailed

information.)

•

With

a

conventional

dedicated

flash

unit

(AF400T,

AF280T,

AF200T

and

AF080C),

a

flash

-sync

speed

of

1/100

second

and

an

aperture

of

f/4

(f/8

for

AF080C)

are

set

as

soon

as

the

flash

is

fully

charged

(at

ISO

100).

However,

these

units

are

not

recommended

for

daylight

flash

sync

photography.

•

With

zoom

lens

whose

maximum

aperture

changes

(from

f/3.5

to

f/4.5,

for

example)

according

to

the

focal

length,

the

f-number

indication

(e.g.

f

/4,

ISO

100)

may

start

blinking

to

indicate

that

exposure

is

out

of

the

coupling

range,

depending

on

the

focal

length

selected.

Be

aware

that

this

might

result

in

underexposed

images

with

the

current

settings.

For

Aperture

-Priority

AE

and

Metered

Manual

modes

•

Select

the

desired

f-number

using

the

lens

aperture

ring.

•

The

flash

-sync

speed

of

1/100

second

is

set

as

soon

as

the

flash

is

fully

charged.

Programmed

Auto

Flash

Mode

For

Programmed

AE

and

Shutter

-Priority

AE

Modes

•

Set

the

flash's

mode

switch

at

one

of

the

AUTO

(red,

green

or

yellow)

positions

for

dedicated

flash

units

such

as

the

AF400T,

AF280T,

AF200T

and

AF200SA.

•

A

combination

of

a

flash

-sync

speed

of

1/100

second

and

a

lens

aperture

is

selected

as

soon

as

the

flash

is

fully

charged,

as

indicated

in

the

chart

below.

(at

ISO

1001

AF400T

AF280T

AF200T

Red

f/4

f/4

f/2.8

Green

f/8

f/8

f

/5.6

Yellow

f/11

-

(AF200SA:

f/4

at

ISO

1001

For

Aperture

-Priority

AE

and

Metered

Manual

Modes

•

Set

the

flash's

mode

switch

at

one

of

the

AUTO

(red,

green

or

yellow)

positions.

•

Set

the

same

f-number

on

the

lens

as

the

one

indicated

by

the

flash's

exposure

scale.

•

The

flash

-sync

speed

of

1/100

second

is

set

as

soon

as

the

flash

is

fully

charged.

•

46

Pentax SF-1 SF-1 Manual - Page 50

Flash, Programmed, Modes

Page 50 highlights