“ I have taken notice that in digital camera models, special sensors help to {focus|concentrate|maintain focus|target|a**** automatically. The sensors with some video cameras change in contrast, while others work with a beam involving infra-red (IR) light, specifically in low light. Higher specs cameras oftentimes use a mix of both methods and may have Face Priority AF where the video camera can 'See' a face while keeping focused only in that. Many thanks for sharing your thinking on this site. ”