
33
Characteristics of HSS Sympathy Flash
C o m p a r e d w it h n o r m a l si n g le-bu r st
ash,theHSSsympathyashprovides
continuousandconstantillumination
for the full duration between the
r s t c u r t a i n o p e n i n g a n d s e c o n d
curtain closing. The contribution of
HSSsympathyashtotheexposure
of t h e i m a g e i s t h e r efo r e d iff e r e n t
t h a n t h atof a n o r m a l a s h:
1.T h e a s h o u t p u t p o w e r i n H S S
S y m p ath y m o d e i s d i f fer e n t f r o m
t h a t of a n o r m a l a s h. T o
c o m p e n s a t e 1 E V e x p o s u r e lossi n
y o u r c a m e r a s e tti n g,yo u n e e d t o
increase the power level of a HSS
s y m p ath y a s h b y 2 E Vs. C h e ckt h e
G N t a ble b elo w forco m p a r is o n:
Power Level
GN (meter) at 105mm, ISO 100
Normal Flash HSS Sympathy
1/1 56 28
1/2 40 23
1/4 28 20
1/8 20 17
1/16 14 14
1/32 10 12
1/64 7 10
1/128 5 8
t o a c h ieve s h a l lo w e r d e pthof eld
whilemaintainingcorrect
exposure.
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