An integrated focal plane provides two co-aligned, overlapping pixel arrays in two formats, one with large pixels and low pixel count, the other with small pixels and high pixel count. Typically, the large pixels are 10 to 100 times larger in area than the small pixels. The dual arrays are disposed in a single detector substrate flip-chip bonded to a single readout circuit. They are sensitive to two infrared colors, one shorter and one longer wavelength band. The dual array focal plane concurrently provides two distinct pixel instantaneous fields of view within the same overall field of view as well as simultaneous fast and slow frame rates. The dual frame rates allow for combined fast sensing with sensitive imaging. Differing spatial and temporal data enables enhanced image processing for improved clutter rejection and detection performance. Differing gains combined with the dual frame rates provide an extended dynamic range.