“ I have realized that in cameras, unique devices help to {focus|concentrate|maintain focus|target|a**** automatically. The actual sensors connected with some camcorders change in in the area of contrast, while others start using a beam associated with infra-red (IR) light, specially in low light. Higher standards cameras at times use a combination of both models and likely have Face Priority AF where the digicam can 'See' any face while keeping your focus only on that. Many thanks for sharing your thinking on this site. ”