Command and Control - Efficient and logical controls include Nikon Dual Command Dials for optimum control. Complete operational information provided through LCD and High Eyepoint Viewfinder. Focus Tracking with Lock-On (TM) - At up to 2.5 frames per second. Exclusive On Demand Grid lines for instant reference for the classic rules-of-composition. Comprehensive Light Metering System - 10-segment 3D Matrix Metering supported by Nikons on board DataBase of over 30,000 stored images plus 75/25 Center Weighted and five Spot meters corresponding to AF sensors. Flash System - 5 Segment TTL Flash Sensors and 3D Multi-sensor Balanced Fill Flash System.