eli5 why do pictures of screens do that weird thing when you zoom on it?

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eli5 why do pictures of screens do that weird thing when you zoom on it?

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Your computer screen actually “refreshes” at a cycle of about 60-360 times per second.

Your camera is catching the process and creating a moire pattern.

If you’re talking about window screens, the answer is nearly the same! It’s still the moire effect – the pixels of the image are in a grid that don’t line up exactly with the lines of the screen and it creates an optical illusion.

It’s called a moiré pattern, and it occurs when viewing a set of lines or dots that is superimposed on another set of lines or dots, where the sets differ in relative size, angle, or spacing.

So I guess in this case you’re viewing the set of dots(pixels) that is your screen but you are viewing another set of lines or dots in that picture you take of another screen and these two sets of dots differ in size, position, angle or spacing, causing that moiré effect.