1. To remote trigger this flash, the camera built-in flash needs to be pop up - The Nissin flash has a built-in detector which required camere build-in to fire in order to trigger the slave mode. Some photographer may find this annoying as they don't want to use the camera built-in flash for their shot.
2. The remote trigger may not be working under bright sunlight - As stated in the manual.
3. The flash will position it's focal length on 35mm when in slave mode - This means that the GN number will be different compared to the full flash power GN number. (35mm, ISO100, GN=22 meters/72 feets)
Based on the fact, this flash on slave mode is best used for indoor as main light source, with camera built-in flash as fill light.
Camera setting (Nikon D40)
Manual Mode (to fix the exposure) on tripod, 1/2 second shutter, 5.6f, ISO 200, Focal Length 55mm, Auto White Balance. One Nissin flash Di466 set to slave mode 1.
Subject
Hedgehog tissue box on tripod, 1 meter away from white wall.
Test result
No flash
Camera built-in direct flash. Shadow fall behind subject.
>Slave flash positioned at lower back of the subject at 1/16 power. Slight shadow fall behind subject.
Built-in flash set to -3.0 flash compensation. Slave flash at camera right. No more shadow.
Built-in flash -3.0 comp. Slave flash at camera left.
Built-in flash -3.0 comp. Slave flash 1/8 power at subject right.
Built-in flash -3.0 comp. Slave flash 1/8 power at subject left.
Built-in flash -3.0 comp. Slave flash on full power, points towards ceiling, at camera top.
Built-in flash -3.0 comp. Slave flash at 1/8 power at lower front subject.








