A convergence is one thing, and gunsight tweaking is another. de-facto gunsight is a range meter. For example the Bf-109 has 32 ft wingspan. Thus we adjust lower ring to 32. Then we set upper ring on 300 yards.
When wingtips of Bf-109 will touch inner ends of horizontal lines it will be 300 yards range.
And a convergence is another messed story. Vertical means horizontal in game and vice versa.
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