Shot I took today to test "slow synch flash". Basically had a pair of old trainers (no sneering Jamey

) taking natural light from front door. Found the shot to look a bit flat, so added slow synch flash.
Tripod Mounted with 50mm f/1.8 lens
2 secs @ f13
Seems to work quite well interms of lifting a natural light shot , instead of a normal stark flash shot.
What are other people's use of this flash mode ?