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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.
Footspeed, or sprint speed, is the maximum speed at which a human can run.It is affected by many factors, varies greatly throughout the population, and is important in athletics and many sports, such as association football, rugby, American football, track and field, and basketball.he fastest human footspeed on record is 44.7 km/h (12.4 m/s or 27.78 mph), seen during a 100 meters sprint (average speed between the 60th and the 80th meter) by Usain Bolt. Maximum human sprint speed is strikingly slower than that of many animals.