Electronic devices may include camera modules. A camera module may include an array camera having an array of lenses and a corresponding array of image sensors. The array of image sensors may include a monochromatic image sensor such as a green image sensor and a polychromatic image sensor such as a red and blue image sensor. The red and blue image sensor may include a color filter array of red and blue color filter elements formed over an array of image pixels. The red and blue color filter elements in the polychromatic image sensor may be arranged in a checkerboard pattern, a zigzag pattern that extends vertically from the top of the pixel array to the bottom of the pixel array, or a diagonal strip pattern. The electronic device may include processing circuitry for combining monochromatic images from the monochromatic image sensor with polychromatic images from the polychromatic image sensor.