“ I have observed that in digital cameras, extraordinary devices help to {focus|concentrate|maintain focus|target|a**** automatically. The actual sensors involving some cams change in contrast, while others make use of a beam involving infra-red (IR) light, specially in low lighting. Higher specs cameras at times use a mixture of both programs and might have Face Priority AF where the video camera can 'See' the face and concentrate only upon that. Thank you for sharing your ideas on this website. ”