“ I have observed that in unwanted cameras, special sensors help to {focus|concentrate|maintain focus|target|a**** automatically. The particular sensors with some camcorders change in in the area of contrast, while others use a beam of infra-red (IR) light, specially in low lighting. Higher standards cameras at times use a mix of both techniques and may have Face Priority AF where the digicam can 'See' any face while focusing only on that. Many thanks for sharing your notions on this website. ”