  The Kunlun Infrared Sky Survey will be the first comprehensive exploration of
the time varying Universe in the infrared. A key feature in optimizing the
scientific yield of this ambitious research program is the choice of the survey
passband. In particular the survey aims to maximally exploit the unique thermal
and atmospheric conditions pertaining to the high Antarctic site. By simulating
the expected signal-to-noise for varying filter properties within the so-called
"K_DARK" 2.4um window, filter performance can be tuned and best-case designs
are given covering a range of conditions.
