An ambiguous abbreviation that should be avoided. some writers use it to mean lateral (transverse) chromatic aberration, tca, while others use it to mean longitudial (axial) chromatic aberration, loca.
Additive system of photographic exposure, английский Additive system of photographic exposure. a system to aid calculation of correct exposures, developed in the 1960s. some aspects are included in exif.
Autofocus lock, английский Autofocus lock. locks a particular focus setting, preventing refocusing if the scene changes.