“ I have taken notice that in old digital cameras, unique sensors help to {focus|concentrate|maintain focus|target|a**** automatically. The actual sensors involving some camcorders change in in the area of contrast, while others make use of a beam of infra-red (IR) light, especially in low lumination. Higher spec cameras oftentimes use a blend of both techniques and might have Face Priority AF where the dslr camera can 'See' any face while keeping focused only in that. Thanks for sharing your ideas on this website. ”