Cactus RF60 - Page 33

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Characteristics of HSS Sympathy Flash
C o m p a r e d w it h n or m a lsi n g le - b u r st 
ash,theHSSsympathyashprovides
continuousandconstantillumination
for the full duration between the
 r st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
HSSsympathyashtotheexposure
of t h ei m a g ei s t h er efor e d if fe r e nt 
t h a n t h at of an or m a l  a s h:
1.T h e  a s h o ut p utp o we r i n H SS 
S y m p at h y m o d e is d if fe r e nt f r o m 
t h at of a n or m a l a s h. To 
c o m p e n s at e 1 E V ex p o s u r e lo ss i n 
y o u rc a m er a s etti n g, y ou ne e dt o 
increase the power level of a HSS
s y m p at h y  a s hb y 2E Vs. C h e ck t h e 
G N t a bleb elo wfor c o m p a r i s 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 ch ie v e s h a llo w er d e pth of eld 
whilemaintainingcorrect
exposure.