论文部分内容阅读
购买缩微设备要根据实际需要。首先要确定建立什么样的缩微系统,需建多大的规模,然后才能着手选购。就此我试谈几点意见供参考。一、缩微系统的种类及其选择 1,按胶片的尺寸可分16毫米、35毫米和105毫米系统。一般地讲,八开以下的档案适用16毫米系统;八开以上的档案适用35毫米系统。但也不尽然,字体较小,线条较细、反差太低或极珍贵的历史档案,以及准备制版印刷的手稿等,虽在八开以内。如用35毫米胶片拍会比用16毫米胶片拍有更好的效果。而字体很大,反差很好的八开以上的档案,也可以用16毫米胶片拍照,如明清档案中的家谱档案等。字体过小,线条过细的大幅地形图、测绘图以及珍贵的历史绘画艺术有时需用70毫米以上胶片或不规则分格的平片拍摄。
Purchase microfilm equipment according to actual needs. First of all, to determine what kind of microfilm system to build what size need to build, and then proceed to buy. In this connection, I will discuss a few comments for reference. First, the type of micro-system and its choice 1, according to the size of the film can be divided into 16 mm, 35 mm and 105 mm system. Generally speaking, the files below Octave are suitable for 16mm system; the files above Octal are suitable for 35mm system. However, it is not always true that smaller fonts, narrower lines, too low contrast or very precious historical records, and manuscripts prepared for plate making and printing are within eight. 35mm film shoot with film than with 16mm film has a better effect. The font is large, good contrast over eight files, you can also use 16 mm film camera, such as file in the Ming and Qing dynasties in the family file. Fonts that are too small, lines that are too thin, topographic maps, mapping, and precious historical art sometimes are shot on plain film with more than 70 mm of film or irregular grids.