Help with Focal Distance between 4:3 and 16:9

[ShockNAwe]

Is there a way to calculate focal distance on a 22 inch 1080p screen playing  4:3 1280x960 with borders?  I'm using focal distance scaling successfully to convert 99 fov to 99.4 fov by using 1906x1072, and this is perfectly matching the sensitivity I'm trying to test.  But in games that use 4:3 hfov to scale, 83 fov which gives you 99.422 hfov, the aim is wrong, helping me to understand that there must be additional focal distance to take into account for the square screen and borders.  I tried to find an answer in the calculator, but haven't been successful. When I use the same 83 fov in a game that locks vertical fov (half life), it works perfectly at 1906x1072.  So this has to be a focal distance issue. 

[DPI Wizard]

On 6/3/2023 at 8:25 PM, ShockNAwe said:

But in games that use 4:3 hfov to scale, 83 fov which gives you 99.422 hfov, the aim is wrong

What game specifically?

[ShockNAwe]

I'm currently using Half life 2, which I verified gives 99.422 at 83fov (I'm using a mouse count calculation). The sensitivity is much slower than the same at 16:9.

The only way I could fix it was to use the focal length for 16:9 960p, which brought it in line with the fake 4:3. I don't think this is right though.