Nissin i40 Instruction Manual page 16

HSS High-Speed Synchronization
i40 supports shutter speeds up to 1/8,000 second.
HSS High-Speed Sync: In A, M, TTL and Wireless mode
On
(A, M, TTL)
Press and hold Pilot button in 3 seconds.
Indicator A starts blinking.
Off
Press and hold Pilot button in 3 seconds to cancel the setting .
NOTE
The HSS High-Speed Sync in Wireless mode are controled by master unit.
Please check your camera instruction manual.
The HSS HIgh-Speed Sync setting you selected is memorized and reminds
unchanged when power on.
Fill-in flash and Light diffusing panel and Soft box
For short distance or portrait flash photography, if the light is not too sharp or
too strong to the subject, use the fill-in reflector flash or diffuse the light with the
supplied soft box.
If the subject is close (within 2 meters), turn the flash head 90°
upward and pull out the fill-in reflector as shown in the picture.
Take a picture as usual. A blink of fill-in flash freshens up the
subject in natural image.
This small blink of flash is also useful when taking a picture of
a baby without scaring him.
Place the Soft box onto the flash head to soften the light
output and reduce the shadows.
This technology is also useful to eliminate the shadow on the
subject under the tree.
For portrait photography, pull out the light diffusing panel and
place it over the flash window as shown in the picture. The
diffusing panel makes the flash light softer.
Since the light diffusing panel expands the lighting area, it
covers the range of 16mm focal length lens.
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