How to calculate the projection distance and projection screen size?

The manual has a projection distance and projection screen size comparison table, taking MS3081 as an example: Method Two: According to the calculation of the projector parameters, taking MS3081 as an example, the projection ratio is 53'@2m, and the scaling ratio is 1.1:1. MS3081 real resolution is 800 * 600, so the best screen aspect ratio is 4:3, if projected 100 inches: The minimum projection distance is 100*2/53=3.77 meters, and the maximum projection distance is 3.77*1.1=4.1 meters. Another: If you need to project other screen aspect ratios, multiply the corresponding coefficients: The optimal screen aspect ratio 4:3 projection distance *1.09 = screen aspect ratio 16:9 projection distance; The optimal screen aspect ratio 16:9 projection distance *1.224 = screen aspect ratio 4:3 projection distance; The optimal screen aspect ratio 16:10 projection distance *1.027 = screen aspect ratio 16:9 projection distance; The optimal screen aspect ratio 16:10 projection distance *1.134 = screen aspect ratio 4:3 projection distance; Note: All test sizes are approximate and the actual size may vary. BenQ recommends that if you want to mount the projector somewhere, you should use this projector for the actual test to confirm the projection size and distance. And refer to its optical performance before installing. This will help you find the most suitable installation location.
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