Here's a full comparison between BFV and BF 2042 scopes (10x missing on BF2042, working on it!). These are the base values showing the true optical zoom, those under 3.00x will be affected by ADS FOV on/off.
BFV are using the actual optical zoom for the scopes.
BF 2042 uses seemingly arbitrarily assigned values, but they almost line up on a linear axis.
Scope
Zoom BFV
Zoom BF 2042
1.25
1.250
1.710
1.50
1.500
1.997
2.00
2.000
2.586
2.50
2.500
3.188
3.00
3.000
3.793
3.50
3.500
4.405
4.00
4.000
5.016
5.00
5.000
6.00
6.000
7.482
7.00
8.711
8.00
8.000
9.950
10.00
10.000
12.420
12.00
14.907
Edit: 10X scope added!