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!