Observations of comet C/2022 E3 (ZTF). Black line: optical spectrum observed with MISTRAL spectrograph camera on the OHP telescope. The spectra, obtained from the 240s frame, were extracted using a 29.2arcsec × 1.93 arcsec aperture with the comet at the center. The dashed red line shows the spectrum obtained from the HCT tele scope (priv. comm.). The typical bright cometary bands such as C₂ and NH₂ are well visible in the spectrum after proper subtraction of the solar continuum and sky lines.