i've just seen that on the new version of the apex calculator, that they are differences between the fov with mouse-settings.com... perhaps did they changed something u didnt noticed @DPI Wizard
https://jscalc.io/calc/Q1gf45VCY4tmm2dq#{"1":1.55,"2":2,"3":1,"4":2560,"5":1440,"6":500,"7":false,"8":null,"11":false,"12":"4ML3","13":90,"14":true}