美制MARK型感光仪是一个小型简便的感光测定仪器。它有5种曝光时间和相应的5种曝光量,为了使被测胶片获得最佳照度,它还配有曝光调节装置;为了适应零级曝光量的变化还备有特制的感光测定表格。为便于消化吸收进口仪器,本文根据我们使用的经验详细介绍了仪器的性能、感光测定表格、零级曝光量计算,以及感光测定法,三点控制法等内容,以供使用该仪器的同志们参考。 The American MARK type photometer is a small and simple photometric measurement instrument. It has five exposure times and the corresponding five exposure levels, in order to get the best illumination for the film under test, it also comes with exposure adjustment device; in order to adapt to changes in the zero-order exposure is also equipped with a special sensitometry table. In order to facilitate the digestion and absorption of imported equipment, this article details the performance of the instrument according to our experience, sensitometry table, zero-order exposure calculation, and sensitometry, three-point control method for the use of the equipment comrades reference.