Carl Zeiss began manufacturing simple microscopes in 1846 and combined microscopes in 1857. He manufactured instruments of high precision. Thanks to the work of scientist Ernst Abbe, microscopes have been based on scientific calculations since 1872. This enabled the production of large numbers of microscopes with constant excellent quality. In addition to science, this made microscopes available for routine tasks in clinics, for checking materials and for educational purposes. The development of microscopes continued and resulted in new types of microscopes with new technologies such as the well-known Axiomat in 1973, and the LSM laser scanning microscope, a microscope system with object scanning through an oscillating laser beam and electronic image processing.