U-Boot Periscope Telemeters

[Nikdunaev]

Originally Posted by diego_gut

The zoom and field of view had different ratios, perhaps that made it impossible to calibrate the graticle for both.

Sorry, I am not sure I understand what you are saying

The optical magnification in telescopes is increasing the apparent angular size of an object by a certain factor, compared to what would be seen by the naked eye.
The decrease in field of view, looking through the same eyepiece, is a direct consequence of that, right?

So, it seems that zoom and field of view are proportionally linked to each other by definition.
If not, than the magnification power number is just meaningless.