In patch 0.9.5 to all but light tanks reduce visibility.
For example:
IS-8. Will be 370, there were 400
WT Pz4. Will be 320, there were 410 were
T-54. Will be 370, there were 390 were
T-44. Will be 360, there were 380 were
ISU-152. Will be 310, there were370 were
IS-3. Will be 360, there were 350
Rhm.-Borsig. Will be 310, there were 400
Pz.Kpfw. VI Tiger (P). Will be 360, there were 380
Jagdpanther. Will be 300, there were 370
T20. Will be 350, , there were 390
Lorr.155 51. Will be 280, there were 360
GW Panther. Will be 270, there were 370
Light tanks, opposite overview increase.
For example:
AMX-13-75: 430 (390)
T21: 420 (390)