The guide number is 12 (ISO 100 in meter).
The flash range with camera sensitivity AUTO:
Wideangle: 0.16m - 6.1m, telephoto: 1.13m - 4.8m (from front of the lens)
Wideangle: 0.23m - 6.1m, telephoto: 1.2m - 4.8m (from CCD)
In Macro photography with a built-in flash, the bottom of the image will be darker. In this case, use of program flash (sold separately) is recommended.