Sunlight-Flash Photography - Sekonic Studio Deluxe L-28 C2 Instruction Book

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2 0 :
1 9 :
1 8 :
t 7 :
t 6 :
t 5 :
1 4 :
1 3 :
1 2 :
l l :
l 0 :
9 :
8 :
7 :
6 :
5 :
4.5 :
4 :
3.5 :
3 :
2.75 :
2.5 :
' t ) \ .
2 :
1.75 :
1 . 5 :
1.25 :
1 :
*M;i.
4 * 4 . e . .
Q
r . i . r t .
4 L
R e d u c t i o n
I
f v f a g n i f i c a t i o n
Ratio of Object Correction I Rutio of Object Corre"tion
l n
l m a ^ ^
l E ^ ^ + ^ -
r ^
l - ^ - -
r - - t - - -
TABLE 1: Exposure Correction for Closeups
(Correction Factor is (M*l)z where M is the magnifi.
ca t i o n . )
5-7. Sunlight-Flash Photography
T h e s i m p l e s t a n d q u i c k e s t m e t h o d o f a c c u r a t e l y b a l a n c -
i n g s u n l i g h t w i t h f l a s h i s o f f e r e d b y S e k o n i c S t u d i o D e l u x e .
F o r t h e f i r s t t i m e t h e s a m e b a s i c m e t h o d o f l i g h t b a l a n c e
u s e d b y p r o f e s s i o n a l s t u d i o p h o t o g r a p h e r s i s a p p l i e d t o
f l a s h p h o t o g r a p h y . T h i s m e t h o d , t h e m o s t e f f i c i e n t y e t
d e v i s e d , a c c u r a t e l y c o n t r o l s c o n t r a s t s b e t w e e n b r i l l i a n t
l i g h t a n d d a r k s h a d o w s .
1 . D e t e r m i n e t h e i n t e n s i t y o f t h e s u n l i g h t b y d i r e c t i n g
L u m i s p h e r e f r o m t h e s u b j e c t p o s i t i o n t o w a r d s t h e
s u n . F o r e x a m p l e , s h o u l d r e a d i n g d i r e c t e d t o w a r d s
t h e s u n w i t h t h e H I G H S l i d e i n d i c a t e 2 O 0 f o o t - c a n d l e s .
the effective foot-candle number is 640O (2OOx32).
2 .
S e l e c t a m a i n t o f i l l - i n l i g h t r a t i o .
A p o p u l a r o n e
i s 4 t o 1 , ( i . e . , t h e f i l l - i n l i g h t t o h a v e L l 4 l i g h t i n -
t e n s i t y o f t h e m a i n l i g h t ) .
W i t h 6 4 0 0 e f f e c t i v e f o o t - c a n d l e s , u s e d i n t h e e x a m p l e
a b o v e , t h e f i l l - i n s s h o u l d r e g i s t e r 1 6 O 0 ( 6 4 0 O + 4 )
f o o t - c a n d l e s .
3 .
L o o k d o w n t h e l e f t c o l u m n o f t h e f l a s h b u t b c h a r t o n
page 42-45. Locate 160O. Read across to learn
t h e d i s t a n c e t h e f l a s h m u s t b e h e l d f r o m t h e s u b j e c t
f o r s p e c i f i e d f l a s h b u l b s a n d s h u t t e r s p e e d s . F o r a
P r e s s 2 5 u s e d a t a s h u t t e r s p e e d o f L / 1 O O , t h e
f l a s h l a m p m u s t b e h e l d 2 2 7 1 2 f o o t f r o m t h e s u b j e c t
f o r t h e p r o p e r 4 t o L s u n - t o - f l a s h r a t i o .
4 . C a m e r a s e t t i n g s m a y b e o b t a i n e d b y u s i n g t h e l i g h t
v a l u e f o u n d i n ( 1 ) .
t o l m a g e
i F a c t o r
t o l m a g e
-
F a c t o r
t . t 0
t . 1 l
1 . 1 I
r . t 2
1 . 1 3
1 . 1 4
1 . 1 5
1 . 1 6
1 . 1 7
l . t 9
t . 2 l
1 . 2 4
1 . 2 7
1 . 3 1
1 . 3 6
1.44
1 . 5 0
1 . 5 6
1.65
1 . 7 8
1 . 8 6
r . 9 6
2.09
2.25
2.47
2.78
3.24
4.00
{hr5,l#ffil6s------
l*5L-
'
: l
: 1 . 2 5
: 1 . 5 0
: 1 . 7 5
. 1
: 2.25
: 2.5
: 2.75
: 3
: 3.5
: 4
: 4 . 5
: 5
: 6
: 7
: 8
: 9
: 1 0
: 1 1
: 1 2
: 1 3
: 1 4
: 1 5
: 1 6
: 1 7
: 1 8
: 1 9
: 2 0
4
5
6
t . >
9
1 0 . 5
l 2
t 4
t 6
20
25
30
36
49
64
8 t
1 0 0
121
t44
169
196
225
2s6
289
324
361
400
44r

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