## Update -- NSFCam Photometric Color Transformations

Sandy Leggett has kindly provided information concerning
the photometric color transformations of IRTF's NSFCam filters.
The NSFCam J, K, and L' filters are effectively identical to those in
UKIRT's IRCAM. NSFCam's H filter can be transformed to the
UKIRT system via:

(H - K)UKIRT =
0.82 (+/-0.02) x (H - K)IRTF

valid for 0 <= (H-K)UKIRT <= 0.5.

Using the CIT to UKIRT transformations of Casali & Hawarden 1992
then gives the following relationship between the IRTF NSFCam system
and the CIT (Elias standards) system:

KCIT =
KIRTF - 0.018 x (J - K)IRTF

(J - K)CIT =
0.936 x (J - K)IRTF

(H - K)CIT =
0.79 x (H - K)IRTF

(K - L)CIT =
0.820 x (K - L)IRTF

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