Well if you can use personal weapons you can also use Binocular with the commander specially with turretless tanks is a good way to spot targets in the distance. You will be able to use it while you are on the vehicle.
Yeah many tanks have specially with IS-2 I’m using it a lot since the visibility of Russian tanks is not that good so binocular is very handy in many situations. To bad my Chi-Ha and Greyhound cant use it