  Scientific CMOS image sensors are a modern alternative for a typical CCD
detectors, as they offer both low read-out noise, large sensitive area, and
high frame rates. All these makes them promising devices for a modern
wide-field sky surveys. However, the peculiarities of CMOS technology have to
be properly taken into account when analyzing the data. In order to
characterize these, we performed an extensive laboratory testing of two Andor
cameras based on sCMOS chips -- Andor Neo and Andor Marana. Here we report its
results, especially on the temporal stability, linearity and image persistence.
We also present the results of an on-sky testing of these sensors connected to
a wide-field lenses, and discuss its applications for an astronomical sky
surveys.
