Fluid inclusion study in opaque minerals using IR micloscopes and cameras is known since 1984. Using IR diodes and lamps coupled to petrographic microscope and Fluid Inc. heating/freezing stage, microscopy and microthermometry in sphalerite, wolframite, and hematite have been performed at the CDTN fluid inclusion laboratory. The obtained results and constraints to the used technique are presented.Fluid inclusion study in opaque minerals using IR micloscopes and cameras is known since 1984. Using IR diodes and lamps coupled to petrographic microscope and Fluid Inc. heating/freezing stage, microscopy and microthermometry in sphalerite, wolframite, and hematite have been performed at the CDTN fluid inclusion laboratory. The obtained results and constraints to the used technique are presented.