[old_tv_nut]

Optional diascope must mean that registration was done manually on a chart. And the variation in chromatic abberation of the lenses with zoom must have been acceptable.

In HD cameras, my guess (without any evidence, have to try looking it up) is that they went through three stages:
1) Tubes with lookup tables for RGB raster size compensation.
2) Solid state HD sensors with improved lenses
3) Solid state HD sensors with digital lens compensation, once digital video processing became powerful enough

Maybe we have someone here who knows?

EDIT: In (2) and (3) there would be some differences in the case of three (RGB) sensors vs. a single Bayer pattern sensor