Katod tubes are the only Russian "Gen3"
Generation really refers to the design of the tube not necessarily the performance, although each generation has different performance limits
Gen 1 = shit, unusable without lots of ambient light or IR illumination
Gen 2 = runs from pretty crap to pretty good (and hilarious $ for the pretty good, see DEP/Photonis XR5 prices)
Gen 3 = pretty good to ~*amazing*~
Poor gen 3 can be worse than the best gen 2
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