The D2 500 recycles to full power in 0.6 seconds, almost half the time as the D1 500, and in Freeze Mode, achieves flash durations as short as 1/63,000 of a second, outperforming most studio pack systems. That's good news for special effects photographers and sports shooters. It can also shoot bursts of 20 flashes per second, so you're sure to capture peak action or several versions of it. In addition, the D2 also supports High Speed Sync up to 1/8000 of a second for photographers who want to stop action or use wide apertures with full ambient light control. The 10-stop power range gives ample choices to achieve your objective.