The present invention provides a composing microscope for scanning a large area of a specimen in a minimal amount of time. In a first embodiment, the composing microscope has a plurality of optical sensors and a plurality of optical projecting systems arranged adjacent to each other. Each of the projecting systems acquires an image from one location of a specimen and projects the image on one of the optical sensors for digitalizing the image. An image acquisition device is connected to the optical sensors for simultaneously storing the digitalized images with information of their locations on the specimen. In a second embodiment, a composing microscope has an optical sensor and a plurality of optical projecting systems arranged adjacent to each other in rows. Each of the optical projecting systems has a first end for acquiring an image at one location of a specimen and a second end. An optical reflector moveable with respect to the second ends of the optical projecting systems receives the images from a row of the optical projecting systems at the second ends and projects the images on the optical sensor, and the optical sensor simultaneously digitalizes the images. An image acquisition device simultaneously receives and stores the digitalized images with information of their locations on the specimen. In a third embodiment, a composing microscope has an optical sensor and a plurality of optical projecting systems arranged adjacent to each other. The projecting system has a first end and a second end connected to the optical sensor. Each of the optical projecting systems acquires an image of one location of a specimen at the first end and projects the image on the optical sensor for digitalizing the image. An image acquisition device is connected to the optical sensor for storing the digitalized images with information of their locations on the specimen.