For some reason, so many low tier vehicles have this arbitrary sight zoom and fov value (1.9x-3.5x and 40
°-21°), and this has been the case for years now, first i thought it was a coincidence but now that im looking its like any vehicle that isnt very well known, mass produced with info available with a simple google search, Gaijin gives the same (terrible) optic zoom and fov.
I feel like this is a case of them doing minimum research and expecting the details to be researched by the player base and bug reported. The player base is usually quick to do the work for popular top tier vehicles but for low tiers stuff like that stays unfixed and gaijin never bothers to come back and actually finish their work, they just move on… (If info is simply unavailable then sure but they need to be transparent about that)