  TIFR Near Infrared Imaging Camera-II is a closed-cycle Helium cryo-cooled
imaging camera equipped with a Raytheon 512 x 512 pixels InSb Aladdin III
Quadrant focal plane array having sensitivity to photons in the 1-5 microns
wavelength band. In this paper, we present the performance of the camera on the
newly installed 3.6-m Devasthal Optical Telescope (DOT) based on the
calibration observations carried out during 2017 May 11-14 and 2017 October
7-31. After the preliminary characterization, the camera has been released to
the Indian and Belgian astronomical community for science observations since
2017 May. The camera offers a field-of-view of ~86.5 arcsec x 86.5 arcsec on
the DOT with a pixel scale of 0.169 arcsec. The seeing at the telescope site in
the near-infrared bands is typically sub-arcsecond with the best seeing of
~0.45 arcsec realized in the near-infrared K-band on 2017 October 16. The
camera is found to be capable of deep observations in the J, H and K bands
comparable to other 4-m class telescopes available world-wide. Another
highlight of this camera is the observational capability for sources up to
Wide-field Infrared Survey Explorer (WISE) W1-band (3.4 microns) magnitudes of
9.2 in the narrow L-band (nbL; lambda_{cen} ~3.59 microns). Hence, the camera
could be a good complementary instrument to observe the bright nbL-band sources
that are saturated in the Spitzer-Infrared Array Camera ([3.6] <= 7.92 mag) and
the WISE W1-band ([3.4] <= 8.1 mag). Sources with strong polycyclic aromatic
hydrocarbon (PAH) emission at 3.3 microns are also detected. Details of the
observations and estimated parameters are presented in this paper.
