SB25: (1992-94). Designed to take advantage of new features in N90 and D type lenses. All the same features as SB24 plus: FP High Speed mode allows flash sync speeds up to 1/4000, built-in wide angle adapter for coverage of 20mm lens, built-in diffuser card for bounce flash, higher flash frequency and bursts in Repeating mode, manual power can now be reduced to 1/64 power in 1/3 steps, additional mounting pin for secure attachment. Main features: Matrix or center weighted TTL pattern, matrix balanced or center weighted fill flash, first or second curtain flash sync, auto zoom head position for coverage from 24mm to 85mm, repeating flash, LCD panel, flash head tilts up and swivels for bounce lighting. AF-assistIlluminator for focusing in dim light. In Auto mode there are 6 settings from f/2 to f/11 at ISO 100 as well as Manual settings from full to 1/64 power in 1/3 steps. Optional external battery packs SD-7 (C-cell), SD-8 (AA). SC-17 cord for off camera TTL operation.