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We present the results of a three-year campaign of broad-band photometry in the near-infrared J, H, K and L 0 bands for a sample of approximately 250 giant stars carried out at the Observatorio del Teide (Tenerife, Spain). Transformations of the Telescopio Carlos S anchez system into/from several currently used infrared systems are extended to the redward part of the colour axis. The linearity of our photometric system in the range 3m ag (Fe/H) > 3. Data of comparable quality previously published have been added to the sample in order to increase the reliability of the relations to be ob- tained. We also provide mean IR colours for giant stars according to spectral type 1 .

Broad-band $JHK(L')$ photometry of a sample of giants with 0.5 $\mathsf{>}$ [Fe/H] $\mathsf{>}$ -3