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16:9 and 4:3 conversion

Rule of 92

I use the Rule of 92 for 16:9 (1.78:1) movies. If you have a 4:3 display, then just multiply the diagonal size by 92% to get the on screen movie size. Here's an example using a 50" 4:3 display: 50 x .92 = 46" diagonal screen size of equal 16:9 display. If you have a 16:9 display and want to know how large a 4:3 display would have to be to display the same diagonal movie size, then reverse the process: 60 / .92 = 65.22" diagonal screen size of equal 4:3 display. It's accurate to a quarter of an inch.


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