Nikon SB-400 User Manual

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Notes on continuous flash shooting
To prevent the SB-400 from overheating, allow the SB-400 to cool down 
for at least 10 minutes after the maximum number of continuous firings 
have been performed as shown in the table below.
Max. number of continuous firings
Flash mode
Max. number of continuous 
firings
i-TTL auto flash 
Manual flash (Flash output level: M1/1, M1/2)
15
Manual flash (Flash output level: M1/4 to M1/128)
40
Do not exceed the maximum number of continuous 
firings, as this may cause the flash head to overheat and can 
result in burns and damage to the flash panel and body.
CAUTION
Be careful when replacing batteries after continuous 
flash use, because batteries may generate heat during 
continuous flash photography.
CAUTION