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Minolta auto electroflash 450 Owner's Manual page 18

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4 . F u r t h e r o p e r a t i o n i s a s d e s c r i b e d i n
i n s t r u c t i o n s 7 a n d B o n p p . i 4 a n d 1 5 .
Because the flash operates at fixed
m a x i m u m d u r a t i o n o n m a n u a l , h o w -
e v e r , t h e n u m b e r o f f l a s h e s a t f u l l
p o w e r w o u l d b e a b o u t 7 0 , w i t h a
2 3 - s e c . r e c y c l i n g t i m e ;
a t
p a r t i a l
p o w e r , a b o u t 1 0 0 w i t h 1 4 s e c . F u r -
t h e r , a t p a r t i a l p o w e r , t h e l e n s a p e r -
t u r e s h o u l d b e o p e n e d o n e - h a l f s t o p
m o r e t h a n i n d i c a t e d b y t h e d i a l .
( W i t h A S A 2 5 o r D l N 1 5 f i l m , f o r
e x a m p l e , t h e f l a s h d i a l i n d i c a t e s a n a p e r -
t u r e o f b e t w e e n F 4 a n d F 5 . 6 f o r a s u b j e c t
5 m o r 1 6 f t . f r o m t h e f l a s h . S e t t h e
c a m e r a l e n s a p e r t u r e t o t h e F - n u m b e r
o p p o s i t e t h e a p p l i c a b l e d i s t a n c e - s a y , b e -
t w e e n F 4 a n d F 5 . 6 f o r a d i s t a n c e o f 5 m
o r 1 6 f t . , o r o n e - h a l f s t o p f a r t h e r o p e n ,
i . e . , a t F 4 f o r p a r t i a l p o w e r - a n d p r o c e e d
t o s h o o t . )
N O T E :
Ex po s u r e at a p e rt u re s i n d i c a t e d sh o u l d
b e co r re ct f o r s u bj e c t s a n d s u r ro u n d i n g
c o nd it io n s o f a v e ra g e r e f l e c t i v i ty . W i t h
v e ry lig h t- co l o re d s u b j e ct s a n d l o r i n s m a l l ,
b rig h t ro o m s, e t c. , e x p os u r e m a y n e e d t o
be reduced by closing the lens aperture
down somewhat. Dark-colored subjects
a n d / or l ar g e , h i g h r o o m s; o u t d o o rs a t
n ig ht ; a n d c o m p a ra b l e c o n d i t i o n s g e n e r a l -
ly re q u ire in cr e a s i n g e x p o su r e s o m e w h a t
b y o p e ni ng t h e l e n s a p e rt u re . T h e e x a ct
number of stops' increase or decrease in
e xp o s u re w il l o f c o u r s e v a ry w i t h i n d i -
v i d u a l c o n d i t i o n s . l t i s g e n e r a l l y r e c o m -
m e n d a b le in n o n - a v e ra g e c o n d i ti o n s t o
take "bracketed" exposures at several
different apertures.

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