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I guess you mean the fov when the player is 100% zoomed in. (because zoomed out the fov would fluctuate.
However, the common norm in default fov for first person is between 60-75 (Sometimes 90 aswell) So try those numbers and see what you can come up with.
Otherwise to account for the player zooming out I guess you would have to find out how far the player zoomed out and do some math with that :P
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