Pentax SF-10 SF-10 Manual - Page 30

•

Effective

flash

range

in

Programmed

Auto

Flash

mode

Maximum

aperture

Effective

range

f/1.4

-

2.8

0.9m

-

4.3mm

f/4

0.7m

-

3m

f/5.6

0.7m

—

2.1m

Note:

The

effective

flash

range

(from

the

film

plane

to

the

subject)

differs

depending

on

the

maximum

aperture

(the

smallest

f-number)

of

the

lens

in

use.

(Technical

Tip]

How

to

determine

the

maximum

aperture

If

the

marking

on

your

lens

reads

"SMC

PENTAX-F

ZOOM

1:4-5.6

35-105,"

for

example,

it

has

a

maximum

aperture

of

f/4

at

the

focal

length

of

35mm

and

f/5.6

at

105mm.

Operational

precautions

1

While

the

RTF

is

being

charged,

keep

your

finger

off

the

shutter

release

button.

2.

RTF

flash

warning

When

using

the

lenses

listed

below,

the

camera's

safety

mechanism

warns

against

use

of

the

RTF;

flash

marks

in

the

LCD

panel

[

IL%

and

viewfinder

5

begin

to

blink

when

the

shutter

release

button

is

lightly

pressed

at

the

completion

of

flash

charge.

In

this

case,

even

if

the

shutter

release

button

is

pressed,

the

RTF

will

not

discharge

and

the

camera

is

automatically

switched

to

the

normal

shooting

mode.

•

Lenses

with

a

focal

length

of

less

than

35mm.

•

Lenses

with

a

focal

length

of

over

210mm.

•

Macro

lenses.

The

purpose

of

this

warning

is

to

prevent

vignetting

at

four

corners

of

a

picture

due

to

lack

of

illumination

or

semicircular

vignetting

at

the

bottom

of

a

picture

due

to

the

lens

blocking

the

illumination

path

of

the

RTF.

Since

this

mechanism

is

activated

only

in

combination

with

F

-series

lenses

(lenses

with

the

marking

of

SMC

PENTAX-F),

no

warning

appears

in

combination

with

other

lenses,

so

care

is

advised

when

using

lenses

other

than

F

-series

lenses.

•

26

Pentax SF-10 SF-10 Manual - Page 30

Pentax SF-10 Manual

Page 30 highlights