An imager comprising an image sensor, in particular a CMOS image sensor, for electronic cameras that has a plurality of pixels arranged in rows and columns (13, 14), wherein at least one common column line (17, 19) is associated with a plurality of pixels of a column (13, 14), and wherein each pixel comprises a light-sensitive detector element, which is configured to generate electric charge from light incident during an exposure, and a reset device which is configured to reset charge present in the pixel to a reference value, wherein the imager has a control device which is configured to couple a respective pixel to the associated column line (17, 19) in order to successively output a reference voltage signal that corresponds to the reference value and an image voltage signal that corresponds to the generated electric charge at the column line (17, 19), wherein the imager has at least one converter unit which has a first analog-to-digital converter and a second analog-to-digital converter, wherein the control device is configured to apply the reference voltage signal of the respective pixel to a signal input of the first analog-to-digital converter for conversion into a digital reference signal value and to simultaneously apply the image voltage signal of the respective pixel to a signal input of the second analog-to-digital converter for conversion into a digital image signal value, characterized in that the image sensor has at least a first and a second memory unit (223, 225), wherein each of the first and second memory units (223, 225) comprises a first memory for holding the reference voltage signal and a second memory for holding the image voltage signal, wherein the control device is configured to selectively connect the signal input of the first analog-to-digital converter to the first memory of the first memory unit and to simultaneously connect the signal input of the second analog-to-digital converter to the second memory of the first memory unit, or to connect the signal input of the first analog-to-digital converter to the first memory of the second memory unit and to simultaneously connect the signal input of the second analog-to-digital converter to the second memory of the second memory unit, wherein the first and second memory units (223, 225) are associated with two different columns (13, 14) of pixels. wherein the imager has a control device which is configured to couple a respective pixel to the associated column line (17, 19) in order to successively output a reference voltage signal that corresponds to the reference value and an image voltage signal that corresponds to the generated electric charge at the column line (17, 19), wherein the imager has at least one converter unit which has a first analog-to-digital converter and a second analog-to-digital converter, wherein the control device is configured to apply the reference voltage signal of the respective pixel to a signal input of the first analog-to-digital converter for conversion into a digital reference signal value and to simultaneously apply the image voltage signal of the respective pixel to a signal input of the second analog-to-digital converter for conversion into a digital image signal value, characterized in that the image sensor has at least a first and a second memory unit (223, 225), wherein each of the first and second memory units (223, 225) comprises a first memory for holding the reference voltage signal and a second memory for holding the image voltage signal, wherein the control device is configured to selectively connect the signal input of the first analog-to-digital converter to the first memory of the first memory unit and to simultaneously connect the signal input of the second analog-to-digital converter to the second memory of the first memory unit, or to connect the signal input of the first analog-to-digital converter to the first memory of the second memory unit and to simultaneously connect the signal input of the second analog-to-digital converter to the second memory of the second memory unit, wherein the first and second memory units (223, 225) are associated with two different columns (13, 14) of pixels.