Complementing the rendering capabilities and speed of the image sensor is the robust Multi-CAM 20K AF system, which features 153 total phase-detection points, including 99 cross-type sensors for improved subject recognition, and 55 of the points are selectable for greater compositional freedom. Benefitting the use of super telephoto lenses and teleconverters, 15 of the points, including nine selectable points, are compatible with an effective aperture of f/8, and all 153 points support working with effective aperture of f/5.6 or brighter.
Managing the abundance of focusing points is a dedicated AF engine, which offers quick response times to benefit tracking fast and randomly moving subjects, even at the top 7 fps shooting rate. The AF engine also contributes to enhanced focusing sensitivity, with all points capable of focusing -4 EV for working in very dark, low-contrast situations.
Furthering the versatility of the focusing system, different AF-area modes can be selected to support varying types of subject matter:
- Single-Point AF: The camera uses a single point to find focus.
- Dynamic-Area AF: Available with 25, 72, or 153-point selections, this mode uses a primary single focus point to lock onto focus, and then makes use of the surrounding points for maintaining focus while tracking erratically-moving subjects.
- Group-Area AF: This mode treats smaller groups of AF points as a single point for a wider field of recognition, and is well-suited to tracking faces or other detailed subjects.
- 3D-Tracking: Using a subject's color information, this mode utilizes all 153 points to maintain focus on a moving subject while half-pressing the shutter button.
- Auto-Area AF: This mode makes use of all 153 points to quickly identify the main subject, and then prioritizes recognized faces as portrait subjects in any AF servo mode.
Lastly, a unique auto AF fine-tune function can be employed to ensure the best possible focus for each mounted lens. Rather than relying on photographing distance charts, this function lets you achieve precise focus manually in live view, and then have the AF system calibrate itself to the fine-tuned focus position in order to alleviate front- and back-focusing issues.
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