The light curve of the HAT-P-3b exoplanet transit did come completely by “fluttering”. Everything seemed to go wrong when measuring, but still the light curve is quite reasonable. At the beginning of the measuring, the camera cell was right on ice. The first target HAT-P-36b failed at all due to camera cell freezing. Due to the conditions, the camera had to be out of the telescope for a few hours and had time to collect some moisture due to temperature differences.