models with leaf shutters within the lens, rather than focal-plane shutters installed inside the camera body, can synchronize with flash at higher speeds than can slrs. flashes on slrs usually cannot synchronize accurately when the shutter speed is faster than 1/60th of a second and occasionally 1/125th. some higher quality dslrs can synchronize at up to 1/500th of a second. leaf shutters allow for flash synchronization at all shutter speeds.