Imaging systems and methods for capturing an image of a subject. The imaging system includes an imaging device that captures images of the subject, a focus mechanism for changing a focal length of the imaging device, and a controller that processes images captured by the imaging device. The imaging device captures a plurality of images of the subject at each of a plurality of focal lengths. The controller generates a sharpness map for each of the plurality of images of the subject at each of the plurality of focal lengths and a composite image of the subject by blending together the plurality of images at each of the plurality of focal lengths into a single image based on the sharpness maps.