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I have realized that in cameras, extraordinary devices help to aim automatically.
Those sensors of some video cameras change in in the area of contrast, while others make use of a beam involving infra-red (IR) light, especially in low lighting.

Higher specification cameras sometimes use a mix of both methods and
probably have Face Priority AF where the photographic camera can 'See' your face while keeping focused only upon that.
Thanks for sharing your thinking on this site.
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