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Where is the ambient light sensor on iMac 27' 2020? I'd like to put a webcam cover without affecting the sensor.

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8 mm to left of webcam on my 2019 iMac - I think yours is the same. Look carefully and you should see a 1 mm grey circle. But a finger over it and (with auto-brightness enabled) the screen will dim a bit.

You should still be able to cover just the webcam.

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  • Can you verify if there is a 1mm grey circle to the RIGHT of the webcam on the 2019 iMac? I put my webcam cover to the right and think I may have missed it! My vision is poor... I ask because there is a second 1mm grey circle to the RIGHT on my 2013 iMac. thanks
    – John
    Commented Mar 25, 2023 at 19:18
  • @John Yes, there is a 1mm grey circle to the Right of the web cam. It is very hard to see. When the web cam is enabled, this is the spot which glows with a green light.
    – Gilby
    Commented Mar 25, 2023 at 20:42

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