Fig. 5From: Development and in-flight calibration of IR2: 2-μm camera onboard Japan’s Venus orbiter, AkatsukiIR2 optics and the holder: a triplet optics of IR2. To lessen excessive stresses between metal and glass at low temperatures, while tolerating the harshest environment of launch, “slitted” spacers in both radial and axial directions are used to hold and align the lensesBack to article page