The K' filter does not have its own set of properly calibrated standard stars, despite its increasing use in astronomy. We have thus interpolated the K' magnitudes from the JHK magnitudes as given in Casali (1992 UKIRT Newsletter, 4, 33), as listed in the previous table. All are listed in the table below for convenience. The interpolated magnitudes seem to give reasonable, consistent results, though the numbers are given here without any express or implied guarantee as to their trustworthiness! UKIRT Faint Infrared Standard Stars Name J H K' K FS 1 13.429 13.048 12.944 12.967 FS 2 10.713 10.504 10.451 10.466 FS 3 12.600 12.725 12.811 12.822 FS 4 10.556 10.304 10.245 10.264 FS 5 12.335 12.340 12.342 12.342 FS 6 13.239 13.305 13.363 13.374 FS 7 11.105 10.977 10.935 10.940 FS 8 9.079 8.442 8.272 8.313 FS 9 9.150 8.424 8.222 8.266 FS 10 14.749 14.870 14.920 14.919 FS 11 11.354 11.294 11.275 11.278 FS 12 13.681 13.807 13.889 13.898 FS 13 10.517 10.182 10.108 10.135 FS 14 14.108 14.182 14.249 14.261 FS 15 12.778 12.420 12.334 12.360 FS 16 12.971 12.669 12.605 12.631 FS 17 12.681 12.343 12.250 12.270 FS 18 10.814 10.553 10.499 10.522 FS 19 13.565 13.654 13.769 13.796 FS 20 13.353 13.404 13.461 13.473 FS 21 12.948 13.031 13.115 13.132 FS 33 14.017 14.162 14.236 14.240 FS 23 12.997 12.446 12.328 12.374 FS 24 10.904 10.772 10.743 10.753 FS 25 10.231 9.826 9.727 9.756 FS 26 8.830 8.127 7.930 7.972 FS 27 13.494 13.181 13.102 13.123 FS 28 10.745 10.644 10.598 10.597 FS 35 12.231 11.846 11.735 11.757 FS 34 12.819 12.919 12.982 12.989 FS 29 13.175 13.271 13.337 13.346 FS 30 11.923 11.979 12.012 12.015 FS 31 13.798 13.919 14.021 14.039 FS 32 13.459 13.576 13.654 13.664 FS 24 is apparently a variable star!