That is not strictly true. A ccd will give a better image direct from 
sensor but cmos output depends on the processing which is always necessary 
because of the low signal. So different systems really. A cmos is capable 
of excellent results as Canon and Kodak DCS owners will testify.

CCD= high quality straight from sensor BUT high power requirement and 
static charge attracts dust. High cost

CMOS= High quality depending on processing. Low power requirement, low 
static, plus the sensor can support electronics that a ccd camera would 
need extra circuit boards for. Lower cost






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