slow-sync

A comparison of a normal flash photo with an exposure time of 1/60 s (left) and the same picture with the use of “slow sync,” i.e. a much longer exposure, in this case 1/8 s (right). Canon 350D, Canon EF-S 18-55/3.5-5.6, 1/60 s and 1/8 s, F5.6, ISO 1600, focus 35 mm