APEX is designed to work at sub-millimetre wavelengths, in the 0.2 to 1.5 mm range — between infrared light and radio waves — and to find targets that ALMA will be able to study in greater detail.
APEX被設計在次毫米波長，範圍在0.2至1.5毫米 －介於紅外線和無線電波之間－ 並找到ALMA可以更仔細研究的目標。