Just a video showing how to match and scale sensitivity in apex and fps games in general.
For 2x, 3x, and 4x optics in Apex Legends I had to test and find the fov in a slightly different way than the 1x I showed in the video so the values may not be exact but here are my findings –
110 fov 1x = 94 fov
110 fov 2x = 67.5 fov
110 fov 3x = 41.6 fov
110 fov 4x = 35.8 fov
Kovaaks sensitivity matcher – https://www.kovaak.com/sensitivity-matcher/
Sensitivity matcher website – https://www.mouse-sensitivity.com/
Fov scaling converter website – https://www.desmos.com/calculator/khnhc27kb5?ref=kovaak.com
Article explaining how focal length sensitivity scaling works – https://www.kovaak.com/sens-scaling/