Copied below the flash range for Sony H5.. If u note, 16m is for Wide at ISO1000!.. chances are our friend here will be shooting at Tele with reasonable ISO (200?) so the flash range is not gonna reach that far..
Range (ISO Auto): 1 to 29 3" (0.3-9.0m) (Wide)
Range (ISO Auto): 35.5 to 22 4 " (0.9-6.8m) (Tele)
Range (ISO 1000): 2 11" to 52 (0.9 -16m) (Wide)
That may be the listing... However, from my own experiences with my H1, the actual flash range is a bit further than listed.