I have a question. I know that 1280 x 1024 is actually a 5:4 aspect ratio, BUT is your screen shape actually 5:4? 5:4 is actually less wide than a 4:3 aspect ratio. In other words, if a 1280 x 1024 resolution is displayed correctly on a standard 4:3 computer monitor, there will be narrow black bars on each side. I've never really understood this resolution option in video cards. I have one monitor, a 21" Sony that actually displays the black bars on each side so the image is actually shaped 1280 x 1024. But on my 19" NEC monitor, which states 1280 x 1024 is the optimal resolution, it fills the 4:3 aspect ratio screen. I really don't understand this, but would assume that the pixels are not true circles or squares, perhaps ovals or rectangles. But in any case, 1280 x 1024 gets "stretched" on many standard monitors to fill the screen horizontally.
Now why do I ask this? We can calculate the exact FOV for 5:4, but it will be less than the default 90. If your monitor is actually shaped 4:3, and 1280 x 1024 fills the screen, it might be better to just leave it at 90. In either case, you won't be experiencing wide screen gaming at 1280 x 1024.
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