CASPIR can measure stars fainter than K 
8.2 mag with 0.5''
pixels in direct imaging mode in seeing conditions of 1-2''. The
IRIS standard star list contains many
stars in this range that are suitable for JHK imaging. These stars
are listed in Table 21 with standard values on
the Carter SAAO system (Carter, B. S., & Meadows, V. S. 1995, MNRAS,
276, 734). Care should be taken to ensure that bright standards do
not saturate the array. This is especially problematical at J. The
fainter equatorial JHK standards from UKIRT can also be used. These
are listed in Table 22. Transformations
equations to the Caltech system of Elias et al. (1982, AJ, 87, 1029)
are:
Transformations from the Caltech system to the original MSSSO and AAO systems are given in McGregor (1994, PASP, 106, 508).
In the 3-4 
m band, and at M must brighter standards are
required. The original MSSSO infrared photometric standards (McGregor
1994, PASP, 106, 508) can be used at these wavelengths. They are
listed in Table 23.
The 2.3 m telescope coordinate file in MAIA::[PETER.OBSERVE]STAND.COORD contains coordinates for stars in these lists.
Table 21: IRIS Photometric Standards (Carter System)
Table 22: UKIRT Photometric Standards (UKIRT System)
Table 23: MSSSO Photometric Standards (MSSSO System)