Nikon D300 User Manual (en)

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U
e2: Flash Shutter Speed
This option determines the slowest shutter speed available when 
using front- or rear-curtain sync or red-eye reduction in 
programmed auto or aperture-priority auto exposure modes 
(regardless of the setting chosen, shutter speeds can be as slow as 
30 s in shutter-priority auto and manual exposure modes or at 
flash settings of slow sync, slow rear-curtain sync, or red-eye 
reduction with slow sync). Options range from 
1
/
60
s ([1/60 s], the 
default setting) to 30 s ([30 s]).