Olympus 35SP Petunjuk Manual - Halaman 28
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S e t t i n g t h e s h u t t e r s p e e d
- l n
t h e c a s e o f f l a s h b u l b , s e t t h e s p e e d a t 1 / 3 0
s e c . ( m a r k e d i n r e d ) t o o b t a i n c o r r e c t s y n c h r o -
n r z a t r o n .
a ) F / s t o p w i t h f l a s h m a t i c m e c h a n i s m .
F i r s t y o u h a v e t o d e t e r m i n e t h e g u i d e n u m b e r ,
b a s i n g o n s u c h e l e m e n t s a s k i n d s o f f l a s h b u l b
o r f l a s h g u n a n d f i l m t o b e u s e d , a n d s h u t t e r
s p e e d . A f t e r s e t t i n g t h e F / s t o p a t t h i s g u i d e
n u m b e r . y o u h a v e o n l y t o f o c u s o n t h e s u b j e c t .
E x p o s u r e w i l l b e a u t o m a t i c a l l y a d j u s t e d t o t h e
d i s t a n c e b y t h e c a m e r a i t s e l f .
a l
F o r e x a m p l e , i f A G - 1 b u l b i s u s e d w . i t h P e n
F l a s h C L , a t s h u t t e r s p e e d 1 / 3 0 s e c . , t h e
g u i d e n u m b e r w i l l b e 2 8 ( m ) ( A S A 1 0 0 ) . t f
A G - 1 8 i n u s e , t h e g u i d e n u m b e r 2 0 .
b ) S e t t i n g t h e F / s t o p w i t h o u t f l a s h m a t i c m e c h a -
n t s m .
S e t t h e s u b j e c t i n f o c u s , a n d r e a d t h e d i s t a n c e .
D i v i d e t h e g u i d e n u m b e r o f t h e f l a s h b u l b o r
e l e c t r o n i c b u l b i n u s e b y t h e d i s t a n c e . ( F i l m
s e n s i t i v i t y a n d s h u t t e r s p e e d a r e o t h e r f a c t o r s
t o b e c o n s i d e r e d . ) S e l e c t a m o s t s i m i l a r n u m b e r
t o t h e v a l u e t h u s o b t a i n e d a s t h e F / s t o o .
S u p p o s i n g t h e
g u i d e
n u m b e r 4 0 ( A S A 1 0 0 )
o f t h e f l a s h b u l b , a n d
t h e d i s t a n c e 5 m e t e r s .
4 0 + 5 = 8 .
T h e r e f o r e , a c o r r e c t e x -
p o s u r e w i l l b e F / 8 .