  We introduce a temporal scheme for data sampling, based on a variable delay
between two successive data acquisitions. The scheme is designed so as to
reduce the average data flow rate, while still retaining the information on the
data evolution on fast time scales. The practical implementation of the scheme
is discussed and demonstrated in light scattering and microscopy experiments
that probe the dynamics of colloidal suspensions using CMOS or CCD cameras as
detectors.
