A read-out arrangement for reading a CCD-sensor (1-1), detector (1-2) which has an active area including pixels that receives charges and a read-out register (1-4) in functional connection with the active area. Charges are transferred from the active area into a read-out register (1-4) and to at least one read-out well (106, 108) arranged in connection with at least output (1-4a1-4b) of the read-out register (1-4). The dynamics of the CCD-sensor can be changed by changing binning of the charges at least partly in response to a control signal.