This is the fastest shutter speed at which the first curtain of a focal plane shutter fully open with and the second shutter curtain has not yet closed. With compact Dynax cameras, this speed is 1/90 to 1/125 second. With the Dynax 8000i, 7xi, 600si, 700si, 800si, and Dynax 7 it is 1/200. The Dynax 9xi and Dynax 9 have a flash sync of 1/300 second, the fastest available.