1. An apparatus comprising: a digital imager able to acquire one or more images; a light detector to detect, without imaging, in response to a triggering event, a light level corresponding to at least a portion of a field-of-view of the digital imager; a controller operative to at least partly determine, based on the detected light level and a pre-programmed algorithm and without imaging, one or more configurational values of the digital imager, to transfer the determined configurational values to the digital imager, and to command the digital imager to rapidly, once turned on by a turning-on process, acquire one or more images utilizing the determined configurational values; and a triggering unit to perform said turning-on process of the digital imager.