How is active optics different from adaptive optics?

Active optics involves the use of adjustable mirrors and other components to correct for atmospheric distortions and maintain the shape of a telescope's primary mirror during observations. It focuses on optimizing the telescope's optical system as a whole to achieve the best image quality. In contrast, adaptive optics specifically refers to real-time corrections made to compensate for atmospheric turbulence, using deformable mirrors that adjust rapidly to improve image clarity. While both techniques enhance image quality, active optics is more about structural adjustments, whereas adaptive optics targets dynamic atmospheric changes.