TISAS ? Soviet tanks

[low_bidder]

Not sure what you mean. IR searchlights were captured from the Nazi's in WW2 and IIRC they appeared on either the T-54 or 55 as factory standard. Are you asking about passive low light systems? They are not suitable for MBT's since firing the main gun washes them out. Are you asking about passive IR systems? BY stand alone in assume you are talking about systems not part of the targeting system or not part of the ballistic computer. Commander and driver systems? Thermal sights?
There is quite a difference in terminology between Soviet and NATO Forces. Soviet MBT's say their tanks are stabilized because stabilized means something different to the Soviets then in the West. To the Soviets, stabilized means the gun (tube & breach) maintains it's position relative to the tank while moving. In the WEST, the gun maintains it's position relative to the TARGET while moving. The difference is that the soviet system doesn't have the breach moving around inside the turret, injuring the crew. Most NATO MBT's have more room inside the turret so it isn't so much of a problem.
So what a soviet tanker would consider TISAS might not be what you consider TISAS
Here is an URL to a reasonably comprehensive site on Soviet MBT's;
http://www.armscontrol.ru/atmtc/Arms_sys...s.htm#t-64
Some mention is made of sighting system but that is it.
Soviet designers never seemed to care about the ergonomics of an MBT. They wanted speed, firepower and armor. Maximizing crew effectiveness wasn't an issue with them. Western MBT"s defeated Soviet MBT"s more often then not because the crews were better. NOT better humans but better rested, better trained, better led. MBT's were about equal.
A slight advantage in one was balanced out by a slight dis-advantage.
You gain speed by reducing armor or increasing horsepower. Increasing horsepower decreases reliability.

The Indians claim the Soviets STILL don't make a passive thermal system worth having. Take this URL with a grain of salt;
http://trishulgroup.blogspot.com/2009/08...-fire.html