  The Cherenkov Telescope Array (CTA) will be the first ground-based
observatory for gamma-ray astronomy. With more than a hundred of 4th generation
of Imaging Atmospheric Cherenkov Telescopes (IACTs) distributed in two large
arrays, CTA will reach unprecedented sensitivity, angular resolution, and
spectral coverage. Three classes of IACTs -- 40 Medium-Sized Telescopes (MSTs),
8 Large-Sized Telescopes (LSTs) and 70 Small-Sized Telescopes (SSTs) -- are
required to cover the full CTA energy range (20 GeV to 300 TeV). NectarCAM is a
Cherenkov camera which is designed to equip medium sized telescopes of CTA,
covering the central energy range from 100 GeV to 30 TeV, with a field of view
of 8 degrees. It is based on a modular design with data channels using the
NECTAr chip, which is equipped with both GHz sampling Switched Capacitor Array
and 12-bit Analog to Digital Converter (ADC). The camera will comprise 265
modules, each consisting of 7 photomultiplier Tubes (PMTs) and a Front-End
Board performing the data capture, sending the data over the Ethernet after the
trigger decision at rates up to 10 kHz. This contribution provides an overview
of the status of the first NectarCAM camera currently under integration in CEA
Paris-Saclay (France). Furthermore, we will discuss the calibration strategies
and present performance results from the CEA Paris-Saclay test bench and from
the first data taken under a real sky on the prototype of medium sized
telescope (MST) structure in Adlershof (Germany).
