1、导言将被摄主体的中性和彩色色调转换成白、灰和黑色的程度影响着照相影像的质量。由于多数显微照相体系的特殊性,只能得到有限的感光测定资料,因而黑白色调还原不易控制。本文介绍了柯达技术用全色(Pan)胶片和T-Max100专业胶片在使用宽范围显影液加工后,在宽的显影反差范围内提供的曝光和反差指数的感光测定试验结果。这是目前适用于显微照相的两种最佳黑白胶片,但 1 Introduction The degree to which the subject’s neutral and color tones are converted to white, gray and black influences the quality of the photographic image. Due to the particularity of most of the photomicrographs, only a limited amount of photometric data can be obtained, so the reduction in black and white tone is not easy to control. This article describes the results of a photographic measurement of the exposure and contrast index provided by Kodak Technology Pan and T-Max100 specialty films over a wide range of developing contrast after processing with a wide range of developing solutions. This is the best black-and-white film currently available for photomicrography but