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1979年《理化检验》物理分册第二期62页介绍了内蒙古铸锻厂冯如骅用“珠江102型”放大机翻摄的经验,我们已按介绍方法作了试验,效果较好。但对幅面大、文字小以及一些金属、非金属材料和产品等缺陷进行翻摄,就不能保证照片足够清晰。为了解决这个问题,我们的做法是:从放大机上取下反光镜和聚光镜,用一块自制的毛玻璃(60×95mm),放在暗盒下片,然后插入放大机片夹位置,即可对被摄物直接调焦,直到在毛玻璃上清晰为止。再取下毛玻璃,在全黑条件下换上软片,就可进行翻摄,效果很好。玻璃质量越好,其上成像就越清晰,调焦就越准确。如果毛玻璃上的成像很小,可揭起铭牌,用5～10倍的放大镜观察成像是否清晰。
In 1979, Physical and Chemical Testing, Volume II, page 62, introduced the experience of Inner Mongolia Casting and Forging Factory Feng Ruhua with “Pearl River 102” magnifier. We have done the experiment according to the introduction method, and the result is better. However, large format, small text and some of the metal, non-metallic materials and defects in products such as photography, you can not guarantee the photos clear enough. In order to solve this problem, our approach is: remove the reflector and condenser from the magnifier, with a piece of homemade glass (60 × 95mm), placed in the cassette under the film, and then insert the magnifier clip position, you can Directly focus the matter until it is clear on the ground glass. Then remove the ground glass, put the film in all black conditions, you can turn the camera, the effect is very good. The better the quality of the glass, the clearer the image is and the more accurate the focus is. If the ground glass imaging is very small, you can lift the nameplate, with 5 to 10 times the magnifying glass to observe the imaging is clear.