"Active optics is not to be confused with adaptive optics, which operates at a shorter timescale and corrects atmospheric distortions." ~ "Active optics", Wikip

"Active optics is not to be confused with adaptive optics, which operates at a shorter timescale and corrects atmospheric distortions." ~ "Active optics", Wikipedia https://en.wikipedia.org/wiki/Adaptive_optics https://en.wikipedia.org/wiki/Adaptive_optics