Continuous Autofocus
Continuous Autofocus (AF-C) is an autofocus mode that continuously adjusts focus to track moving subjects, essential for action photography (sports, wildlife, children). Unlike single-autofocus (AF-S), it dynamically refocuses as subject movement occurs.
Key Characteristics
- Requires predictive algorithms to anticipate subject motion
- Uses dedicated focus tracking sensors/processing
- Performance depends on subject speed, contrast, and lighting
- Typically requires higher processing power than AF-S
Fujifilm Implementation
Fujifilm cameras implement AF-C as a core mode alongside manual-focus and single-autofocus. Optimization details from Fujifilm Autofocus Setup Guide include:
- AF+MF Interaction: The “AF+MF” (Auto Focus + Manual Focus) setting can override Focus Priority settings, potentially causing unexpected blurry photos when the user attempts manual override during tracking.
- Release/Focus Priority: Critical to understand the interaction between “Release/Focus Priority” and “AF+MF” to prevent focus hunting or missed shots in dynamic environments.
- Troubleshooting: Refer to Fujifilm AF+MF overrides Focus Priority, causing blurry photos. for detailed analysis of this specific behavior.
References
- pal2tech, “Fujifilm Setting That Overrides Focus Priority”, Fujifilm AF+MF overrides Focus Priority, causing blurry photos.