Quote:
Originally Posted by AlexN
Not true.
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The first autoguiding systems were built around two photomultiplier tubes, beam splitter and two knife-edge masks... one for each direction.
Guiding star was held on the knife-edge in the closed loop system which was completely analogue.
Of course, the high voltage required for photomultiplier tubes to operate was abig disadvantage and actually a problem I would think (dew and high voltages.. brrrrrrrrr :-(
Anyway.. PC is not necessary ingredient.