  We present some results of testing of commercial color CMOS cameras for
astronomical applications. CMOS sensors allow to perform photometry in three
filters simultaneously that gives a great advantage compared with monochrome
CCD detectors. The Bayer BGR colour system realized in CMOS sensors is close to
the Johnson BVR system. We demonstrate transformation from the Bayer color
system to the Johnson one. Our photometric measurements with color CMOS cameras
coupled to small telescopes (11 - 30 inch) reveal that in video mode stars up
to V $\sim$ 9 can be shot at 24 frames per second. Using a high-speed CMOS
camera with short exposure times (10 - 20 ms) we can perform an imaging mode
called "lucky imaging". We can pick out high quality frames and combine them
into a single image using "shift-and-add" technique. This allows us obtain an
image with much higher resolution than would be possible shooting a single
image with long exposure. For image selection we use the Strehl-selection
method. We demonstrates advantage of the lucky imaging technique in comparison
with long exposure shooting. The FWHM of the blurred image caused by atmosphere
turbulence can be decreased twice and more.
