In one aspect, the invention provides an imaging system including an optical system adapted to receive light from a field of view and direct the received light to two image planes. A fixed image detector is optically coupled to one of the image planes to detect at least a portion of the received light and generate image data corresponding to at least a portion of the field of view. A movable (e.g., rotatable) image detector is optically coupled to the other image plane to sample the received light at different locations thereof to generate another set of image data at a higher resolution than the image data obtained by the fixed detector. The system can include a processor for receiving the two sets of image data to generate two images of the field of view. In some implementations, the processor can employ one of the images (typically the image having a lower resolution) to detect one or more objects of interest (e.g., one or more objects moving within the field of view) and to effect the acquisition of image data corresponding to one or more of those moving objects at a higher resolution (e.g., by controlling the movement of the movable image detector).