Im a normie and I need your help.

I have a camera with a very early autofocus, it has 4 focus points, 1.1m, 1.5m, 3m and infinity. Everything after the 3m mark is either blurry or I dont know how to calculate this progression.

So the first point is 1.1m, then 1.5m, 3m and infinity. Infinity is the unknown value Id like to find out. The differences between the points are, naturally, 0.4m, 1.5m and then the last difference and last point are unknown.

Can anyone calculate this for me? What would be the last point and the difference between the last point?


To me it is important, because all after the 3m mark the camera gets confused as it is an early Visitronic Autofocus.