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Maximum flash sync speed. The maximum flash sync speed is the fastest shutter speed at which the entire image sensor can be illuminated by flash pulse. Most modern digital SLR cameras have maximum flash sync speed of ~1/250 of a second. A few camera models (e.g. Nikon D70(s), D50) have maximum flash sync speed as high as 1/500s. This duration is the upper limit of the flash pulse duration.
Synchronous Speed When Alternating current (AC) is applied to the stator of a three phase motor, a rotating magnetic field is setup. This rotating magnetic field moves with a speed called synchronous speed. The Synchronous speed can be calculated as follows: 120 times the frequency (F), divided by the number of poles (P): The synchronous speed decreases as the number of poles increases. The table below shows the synchronous speed associated with various numbers of poles at supply frequencies of 50Hz and 60Hz: Rated Speed. The speed of operation of an AC motor when fully loaded at rated voltage is called the rated speed.