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When choosing a professional DSLR or mirrorless camera, autofocus and tracking capabilities are critical features for photographers, especially those capturing fast-moving subjects. The Nikon D850 and Sony A9 II are two popular options, each with unique strengths. This article provides a detailed comparison of their autofocus systems and tracking performance.
Autofocus System Overview
The Nikon D850 features a 153-point phase-detection autofocus system, primarily on the optical viewfinder, with 99 points being cross-type sensors. Its autofocus is renowned for accuracy and reliability in various lighting conditions. The Sony A9 II employs a sophisticated hybrid autofocus system with 693 phase-detection points covering approximately 93% of the image area, optimized for speed and precision in live view and video modes.
Autofocus Performance in Practice
The Nikon D850 excels in static subjects and offers excellent autofocus for landscapes, portraits, and studio work. Its autofocus speed is sufficient for most scenarios but may lag behind in high-speed action. The Sony A9 II is designed for fast-paced environments like sports and wildlife photography, with autofocus that locks onto subjects almost instantaneously, even in challenging lighting.
Tracking Capabilities
Tracking moving subjects is vital for dynamic photography. The Nikon D850’s autofocus tracking is reliable but less advanced, relying on its 3D tracking system that works well with predictable movements. The Sony A9 II’s real-time tracking employs AI-based algorithms and eye-tracking technology, maintaining focus on subjects seamlessly as they move across the frame.
Real-World Usage
Photographers capturing fast action will find the Sony A9 II more adept at maintaining focus and tracking subjects like athletes or wildlife. Its high-speed continuous shooting and advanced autofocus system ensure sharp images even in unpredictable movements. The Nikon D850, while excellent for controlled environments, may require more manual adjustments and patience during high-speed shooting.
Summary Comparison
- Nikon D850: 153-point autofocus, reliable for static and predictable subjects, less optimal for high-speed tracking.
- Sony A9 II: 693-point phase-detection, advanced real-time tracking, ideal for fast-moving subjects and sports.
Conclusion
Choosing between the Nikon D850 and Sony A9 II depends on your photography needs. For studio, landscape, and portrait work, the D850 offers excellent autofocus performance. For sports, wildlife, and fast action, the Sony A9 II’s superior tracking and speed make it the better choice.