The development of microscope systems has gone through two stages: finite far optical systems and infinite far optical systems. Around the 1990s, microscope systems evolved from finite far optical systems to infinite far optical systems.

    The Leica microscope DM4M adopts an infinite optical system.

    Leica DM4 M Leica Metallographic Microscope - Manual Digital Industrial Measurement Microscope

    The DM4 M Leica microscope is a manual upright metallographic microscope suitable for imaging, measuring, and analyzing the characteristics of many samples in the field of materials science and analysis. Whether it is a quick overview or a detailed inspection of samples, it always meets the requirements with appropriate settings. It is a typical representative of high-performance manual coding for daily detection and analysis microscopes, and an ideal choice for industrial measurement.

    In an optical system with infinite distance correction, the objective lens and imaging lens are parallel rays, which theoretically have the following advantages:

    Advantage 1: Changing the distance between the objective lens and the imaging lens does not change the magnification

    Advantage 2: Insert a parallel plane plate between the objective lens and the imaging lens, which can also maintain alignment and imaging will not shift

    The two advantages listed here are also very beneficial in the composition of microscope optical systems, therefore, there has always been a; Infinite correction optical system is an ideal microscope optical system&rquote; This statement. If this advantage can be maximized, the intermediate lens tube can be freely inserted or removed in the parallel beam section between the objective lens and the imaging lens to construct the optimal optical system.