An evolution of the N90s with many of the F5's traits, the F100 is a lightweight professional alternative to the big F5. The list of features is not light reading; Nikon's fastest AF, 4.5fps drive speed, professional weather sealing, 10-segment 3D Matrix metering, autobracketing, 22 custom functions...and on and on. It is a popular body with both professionals and advanced amateurs alike for two reasons-a solid feel and exceptional performance.