What is the primary technical advantage of using a third-party camera app for manual ISO control over the native camera app's Night Mode in a challenging low-light video shoot?

The primary technical advantage of using a third-party camera app for manual ISO control over a native camera app's Night Mode in a challenging low-light video shoot is the ability to achieve consistent and predictable exposure and image characteristics across all video frames. Manual ISO control allows the user to precisely set and lock a specific ISO value, which represents the camera sensor's sensitivity to light. By fixing the ISO, every single frame of the video footage is captured with the exact same light sensitivity, resulting in uniform brightness, a stable noise profile, and consistent grain throughout the entire video clip. This consistency is crucial for professional-looking video, as it prevents distracting fluctuations in brightness, sudden changes in image noise, or flickering, all of which are difficult to correct in post-production. For example, setting a manual ISO of 800 ensures every frame in a video sequence is processed with that specific sensitivity, providing a smooth and predictable visual flow. In contrast, a native camera app's Night Mode is fundamentally designed for still photography and relies on computational photography techniques. Night Mode typically works by capturing multiple short exposures, computationally aligning these frames to account for minor movement, and then merging them into a single, brighter, and often noise-reduced still image. While effective for stills, applying this multi-frame processing in real-time to every frame of a video sequence introduces significant issues. If adapted for video, Night Mode's algorithms would constantly evaluate and combine frames, leading to inconsistent frame-to-frame exposure, noticeable brightness shifts (often called 'pumping' or 'flicker'), and temporal artifacts. The varying light conditions within a scene would cause the algorithm to apply different levels of enhancement or exposure bracketing to successive frames, resulting in an unstable and visually jarring video that lacks the temporal coherence essential for motion imagery. Therefore, while Night Mode aims for maximum brightness in a single still image, its inherent design is incompatible with the requirement for consistent temporal exposure in video, which manual ISO control directly provides.