The Nikon Coolpix S640 is touted as the fastest camera in the Coolpix range with an autofocus speed that compares favorably to digital SLRs. It also has a 28-140mm equivalent Nikkor 5x zoom lens with optical vibration reduction, a 12-megapixel sensor, and a 2.7" LCD screen. With specs like this the Coolpix S640 looks like a real winner. So we set out to find out if it would come out as a champion in our testing.