Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 951
Autofocus viewfinder shooting
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Autofocus (viewfinder shooting) Focus method AF points Focusing brightness range TTL secondary image-registration, phase-difference detection with the dedicated AF sensor 191 points max. (cross-type AF points: 155 points max.) * Number of available AF points, Dual cross-type AF points, and Cross-type AF points vary depending on the lens used. * Dual cross-type focusing at f/2.8 with center AF point EV -4 to 21 (with the center AF point supporting f/2.8, One-Shot AF, room temperature, ISO 100) Focus operation One-Shot AF, AI Servo AF, manual focusing (MF) AF area selection mode Subject detection AF Spot AF (manual selection), 1-point AF (manual selection), AF point expansion (manual selection, vertical/horizontal), AF point expansion (manual selection: surround), Zone AF (manual selection of zone), Large zone AF (manual selection of zone), Auto selection AF EOS iTR AF setting (can recognize color information, faces, and heads) * iTR: Intelligent Tracking and Recognition AF Configuration Tool Cases 1-4, Case A AI Servo AF characteristics Tracking sensitivity, Acceleration/deceleration tracking AF fine adjustment AF Microadjustment (All lenses by the same amount, Adjust by lens) AF-assist beam Fired by an external flash unit for EOS cameras 951