大物镜型体视显微镜(如东德蔡司产品、国产XTD-1等)在金相研究方面,特别适用于小型零件的断口、裂纹、疏松等低倍缺陷的观察分析。但因这类显微镜多数不设光阑,成象景深范围很短,所以难以同时观察缺陷的全貌。为充分利用这类显微镜,添置几件简单的附件(图2),便可提高成象质量,见图1。图2中的附件材料为硬铝或低碳钢,经阳极化处 Large objective lens type stereo microscope (such as East German Zeiss products, domestic XTD-1, etc.) in metallographic research, especially for small parts fracture, cracks, loose and other low magnification observation and analysis. However, most of these microscopes do not set iris, imaging depth of field is very short, so it is difficult to observe the full picture of defects. To take full advantage of this type of microscope, adding a few simple accessories (Figure 2), can improve the image quality, shown in Figure 1. The attachment material in Figure 2 is either duralumin or mild steel, anodized