Thank you, I checked this out in the following link:
According to the proposal of this topic, my zoom level should be 80. I tried it, tried to fly with a heli, and it was amazing how look like your screen is a window though the plane. I was completely wrong setting it below 50, instead in my case it should be upper.
The bad thing is about the gauges, but if you want a realistic feeling in terms of distance, I agree with this site. In true life I wouldn’t see gauges with a window in my screen size limiting the view.
That’s my opinion and I tried and agreed with the FOV calculator and the zoom level relations in the link.
Edit: since 80 I was lost too much of gauges, I made some adjustments reducing my screen distance, calculated again and I found the reasonable Zoom level of 66.
Thank you!